Replace __MSG_some_name__ template within extension css/html files with local...

chrome/browser/renderer_host/resource_message_filter.cc

Index: chrome/browser/renderer_host/resource_message_filter.cc
===================================================================
--- chrome/browser/renderer_host/resource_message_filter.cc	(revision 38490)
+++ chrome/browser/renderer_host/resource_message_filter.cc	(working copy)
@@ -1349,15 +1349,18 @@
     IPC::Message* reply_msg) {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::FILE));
 
-  std::string error;
-  scoped_ptr<ExtensionMessageBundle> bundle(
-      extension_file_util::LoadExtensionMessageBundle(
-          extension_path, default_locale, &error));
-
   std::map<std::string, std::string> dictionary_map;
-  if (bundle.get())
-    dictionary_map = *bundle->dictionary();
+  if (!default_locale.empty()) {
+    // Touch disk only if extension is localized.
+    std::string error;
+    scoped_ptr<ExtensionMessageBundle> bundle(
+        extension_file_util::LoadExtensionMessageBundle(
+            extension_path, default_locale, &error));
 
+    if (bundle.get())
+      dictionary_map = *bundle->dictionary();
+  }
+
   ViewHostMsg_GetExtensionMessageBundle::WriteReplyParams(
       reply_msg, dictionary_map);