Allow manifest handlers to declare keys they depend on that must be parsed before them.

chrome/common/extensions/manifest_tests/extension_manifests_homepage_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/manifest_handler.h"
 #include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
 #include "chrome/common/extensions/manifest_url_handler.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace errors = extension_manifest_errors;
 
 class HomepageURLManifestTest : public ExtensionManifestTest {
   virtual void SetUp() OVERRIDE {
     ExtensionManifestTest::SetUp();
-    extensions::ManifestHandler::Register(extension_manifest_keys::kHomepageURL,
-                                          new extensions::HomepageURLHandler);
-    extensions::ManifestHandler::Register(extension_manifest_keys::kUpdateURL,
-                                          new extensions::UpdateURLHandler);
+    extensions::ManifestHandler::Register(
+        extension_manifest_keys::kHomepageURL,
+        make_linked_ptr(new extensions::HomepageURLHandler));
+    extensions::ManifestHandler::Register(
+        extension_manifest_keys::kUpdateURL,
+        make_linked_ptr(new extensions::UpdateURLHandler));
   }
 };
 
 TEST_F(HomepageURLManifestTest, ParseHomepageURLs) {
   scoped_refptr<extensions::Extension> extension(
       LoadAndExpectSuccess("homepage_valid.json"));
 
   Testcase testcases[] = {
     Testcase("homepage_empty.json",
              errors::kInvalidHomepageURL),
@@ skipping 15 matching lines @@
   // The Google Gallery URL ends with the id, which depends on the path, which
   // can be different in testing, so we just check the part before id.
   extension = LoadAndExpectSuccess("homepage_google_hosted.json");
   EXPECT_TRUE(StartsWithASCII(
       extensions::ManifestURL::GetHomepageURL(extension).spec(),
       "https://chrome.google.com/webstore/detail/", false));
 
   extension = LoadAndExpectSuccess("homepage_externally_hosted.json");
   EXPECT_EQ(GURL(), extensions::ManifestURL::GetHomepageURL(extension));
 }