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

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 3e65e3d75f02b7c6cddc1ae10454f443212b5394..35de6d9b4a836d8b1b61eba133c1516b4a9531d4 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -128,10 +128,10 @@ namespace {
 void RegisterExtensionManifestHandlers() {
   extensions::ManifestHandler::Register(
       extension_manifest_keys::kDevToolsPage,
-      new extensions::DevToolsPageHandler);
+      make_linked_ptr(new extensions::DevToolsPageHandler));
   extensions::ManifestHandler::Register(
       extension_manifest_keys::kWebAccessibleResources,
-      new extensions::WebAccessibleResourcesHandler);
+      make_linked_ptr(new extensions::WebAccessibleResourcesHandler));
 }
 
 static void AppendParams(const std::vector<string16>& additional_names,