diff -r 000000000000 -r 6474c204b198 caps/src/nsSystemPrincipal.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/caps/src/nsSystemPrincipal.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* The privileged system principal. */
+
+#include "nscore.h"
+#include "nsSystemPrincipal.h"
+#include "nsIComponentManager.h"
+#include "nsIServiceManager.h"
+#include "nsIURL.h"
+#include "nsCOMPtr.h"
+#include "nsXPIDLString.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsString.h"
+#include "nsIClassInfoImpl.h"
+#include "nsIScriptSecurityManager.h"
+#include "pratom.h"
+
+NS_IMPL_CLASSINFO(nsSystemPrincipal, nullptr,
+                  nsIClassInfo::SINGLETON | nsIClassInfo::MAIN_THREAD_ONLY,
+                  NS_SYSTEMPRINCIPAL_CID)
+NS_IMPL_QUERY_INTERFACE_CI(nsSystemPrincipal,
+                           nsIPrincipal,
+                           nsISerializable)
+NS_IMPL_CI_INTERFACE_GETTER(nsSystemPrincipal,
+                            nsIPrincipal,
+                            nsISerializable)
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsSystemPrincipal::AddRef()
+{
+  NS_PRECONDITION(int32_t(refcount) >= 0, "illegal refcnt");
+  nsrefcnt count = ++refcount;
+  NS_LOG_ADDREF(this, count, "nsSystemPrincipal", sizeof(*this));
+  return count;
+}
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsSystemPrincipal::Release()
+{
+  NS_PRECONDITION(0 != refcount, "dup release");
+  nsrefcnt count = --refcount;
+  NS_LOG_RELEASE(this, count, "nsSystemPrincipal");
+  if (count == 0) {
+    delete this;
+  }
+
+  return count;
+}
+
+static const char SYSTEM_PRINCIPAL_SPEC[] = "[System Principal]";
+
+void
+nsSystemPrincipal::GetScriptLocation(nsACString &aStr)
+{
+    aStr.Assign(SYSTEM_PRINCIPAL_SPEC);
+}
+
+#ifdef DEBUG
+void nsSystemPrincipal::dumpImpl()
+{
+  fprintf(stderr, "nsSystemPrincipal (%p)\n", this);
+}
+#endif 
+
+
+///////////////////////////////////////
+// Methods implementing nsIPrincipal //
+///////////////////////////////////////
+
+NS_IMETHODIMP
+nsSystemPrincipal::Equals(nsIPrincipal *other, bool *result)
+{
+    *result = (other == this);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::EqualsConsideringDomain(nsIPrincipal *other, bool *result)
+{
+    return Equals(other, result);
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::Subsumes(nsIPrincipal *other, bool *result)
+{
+    *result = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::SubsumesConsideringDomain(nsIPrincipal *other, bool *result)
+{
+    *result = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::CheckMayLoad(nsIURI* uri, bool aReport, bool aAllowIfInheritsPrincipal)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetHashValue(uint32_t *result)
+{
+    *result = NS_PTR_TO_INT32(this);
+    return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsSystemPrincipal::GetURI(nsIURI** aURI)
+{
+    *aURI = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsSystemPrincipal::GetOrigin(char** aOrigin)
+{
+    *aOrigin = ToNewCString(NS_LITERAL_CSTRING(SYSTEM_PRINCIPAL_SPEC));
+    return *aOrigin ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetCsp(nsIContentSecurityPolicy** aCsp)
+{
+  *aCsp = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::SetCsp(nsIContentSecurityPolicy* aCsp)
+{
+  // CSP on a null principal makes no sense
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetDomain(nsIURI** aDomain)
+{
+    *aDomain = nullptr;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::SetDomain(nsIURI* aDomain)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetJarPrefix(nsACString& aJarPrefix)
+{
+  aJarPrefix.Truncate();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetAppStatus(uint16_t* aAppStatus)
+{
+  *aAppStatus = nsIPrincipal::APP_STATUS_NOT_INSTALLED;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetAppId(uint32_t* aAppId)
+{
+  *aAppId = nsIScriptSecurityManager::NO_APP_ID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetIsInBrowserElement(bool* aIsInBrowserElement)
+{
+  *aIsInBrowserElement = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetUnknownAppId(bool* aUnknownAppId)
+{
+  *aUnknownAppId = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetIsNullPrincipal(bool* aIsNullPrincipal)
+{
+  *aIsNullPrincipal = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::GetBaseDomain(nsACString& aBaseDomain)
+{
+  // No base domain for chrome.
+  return NS_OK;
+}
+
+//////////////////////////////////////////
+// Methods implementing nsISerializable //
+//////////////////////////////////////////
+
+NS_IMETHODIMP
+nsSystemPrincipal::Read(nsIObjectInputStream* aStream)
+{
+    // no-op: CID is sufficient to identify the mSystemPrincipal singleton
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSystemPrincipal::Write(nsIObjectOutputStream* aStream)
+{
+    // no-op: CID is sufficient to identify the mSystemPrincipal singleton
+    return NS_OK;
+}
+
+/////////////////////////////////////////////
+// Constructor, Destructor, initialization //
+/////////////////////////////////////////////
+
+nsSystemPrincipal::nsSystemPrincipal()
+{
+}
+
+nsSystemPrincipal::~nsSystemPrincipal()
+{
+}