diff -r 000000000000 -r 6474c204b198 content/xul/templates/src/nsResourceSet.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/xul/templates/src/nsResourceSet.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,108 @@
+/* -*- 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/. */
+
+#include "nsResourceSet.h"
+
+nsResourceSet::nsResourceSet(const nsResourceSet& aResourceSet)
+    : mResources(nullptr),
+      mCount(0),
+      mCapacity(0)
+{
+    ConstIterator last = aResourceSet.Last();
+    for (ConstIterator resource = aResourceSet.First(); resource != last; ++resource)
+        Add(*resource);
+}
+
+
+nsResourceSet&
+nsResourceSet::operator=(const nsResourceSet& aResourceSet)
+{
+    Clear();
+    ConstIterator last = aResourceSet.Last();
+    for (ConstIterator resource = aResourceSet.First(); resource != last; ++resource)
+        Add(*resource);
+    return *this;
+}
+
+nsResourceSet::~nsResourceSet()
+{
+    MOZ_COUNT_DTOR(nsResourceSet);
+    Clear();
+    delete[] mResources;
+}
+
+nsresult
+nsResourceSet::Clear()
+{
+    while (--mCount >= 0) {
+        NS_RELEASE(mResources[mCount]);
+    }
+    mCount = 0;
+    return NS_OK;
+}
+
+nsresult
+nsResourceSet::Add(nsIRDFResource* aResource)
+{
+    NS_PRECONDITION(aResource != nullptr, "null ptr");
+    if (! aResource)
+        return NS_ERROR_NULL_POINTER;
+
+    if (Contains(aResource))
+        return NS_OK;
+
+    if (mCount >= mCapacity) {
+        int32_t capacity = mCapacity + 4;
+        nsIRDFResource** resources = new nsIRDFResource*[capacity];
+        if (! resources)
+            return NS_ERROR_OUT_OF_MEMORY;
+
+        for (int32_t i = mCount - 1; i >= 0; --i)
+            resources[i] = mResources[i];
+
+        delete[] mResources;
+
+        mResources = resources;
+        mCapacity = capacity;
+    }
+
+    mResources[mCount++] = aResource;
+    NS_ADDREF(aResource);
+    return NS_OK;
+}
+
+void
+nsResourceSet::Remove(nsIRDFResource* aProperty)
+{
+    bool found = false;
+
+    nsIRDFResource** res = mResources;
+    nsIRDFResource** limit = mResources + mCount;
+    while (res < limit) {
+        if (found) {
+            *(res - 1) = *res;
+        }
+        else if (*res == aProperty) {
+            NS_RELEASE(*res);
+            found = true;
+        }
+        ++res;
+    }
+
+    if (found)
+        --mCount;
+}
+
+bool
+nsResourceSet::Contains(nsIRDFResource* aResource) const
+{
+    for (int32_t i = mCount - 1; i >= 0; --i) {
+        if (mResources[i] == aResource)
+            return true;
+    }
+
+    return false;
+}
+