Localize CSS files in content scripts (but don't localize JS files)....

chrome/renderer/mock_render_thread.cc

Index: chrome/renderer/mock_render_thread.cc
===================================================================
--- chrome/renderer/mock_render_thread.cc	(revision 43656)
+++ chrome/renderer/mock_render_thread.cc	(working copy)
@@ -85,6 +85,8 @@
     IPC_MESSAGE_HANDLER(ViewHostMsg_CreateWidget, OnMsgCreateWidget);
     IPC_MESSAGE_HANDLER(ViewHostMsg_OpenChannelToExtension,
                         OnMsgOpenChannelToExtension);
+    IPC_MESSAGE_HANDLER(ViewHostMsg_GetExtensionMessageBundle,
+                        OnMsgGetExtensionMessageBundle);
 #if defined(OS_WIN) || defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetDefaultPrintSettings,
                         OnGetDefaultPrintSettings);
@@ -120,6 +122,13 @@
   *port_id = 0;
 }
 
+void MockRenderThread::OnMsgGetExtensionMessageBundle(
+    const std::string extension_id,
+    std::map<std::string, std::string>* messages) {
+  DCHECK(messages);
+  messages->insert(std::make_pair("@@extension_id", extension_id));
+}
+
 #if defined(OS_WIN)
 void MockRenderThread::OnDuplicateSection(
     base::SharedMemoryHandle renderer_handle,