diff -r 000000000000 -r 6474c204b198 intl/locale/src/nsUConvPropertySearch.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intl/locale/src/nsUConvPropertySearch.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* 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 "nsUConvPropertySearch.h"
+#include "nsCRT.h"
+#include "nsString.h"
+
+// static
+nsresult
+nsUConvPropertySearch::SearchPropertyValue(const char* aProperties[][3],
+                                           int32_t aNumberOfProperties,
+                                           const nsACString& aKey,
+                                           nsACString& aValue)
+{
+  const char* key = PromiseFlatCString(aKey).get();
+  int32_t lo = 0;
+  int32_t hi = aNumberOfProperties - 1;
+  while (lo <= hi) {
+    uint32_t mid = (lo + hi) / 2;
+    int32_t comp = nsCRT::strcmp(aProperties[mid][0], key);
+    if (comp > 0) {
+      hi = mid - 1;
+    } else if (comp < 0) {
+      lo = mid + 1;
+    } else {
+      nsDependentCString val(aProperties[mid][1],
+                             NS_PTR_TO_UINT32(aProperties[mid][2]));
+      aValue.Assign(val);
+      return NS_OK;
+    }
+  }
+  aValue.Truncate();
+  return NS_ERROR_FAILURE;
+}