Move Extension into extensions namespace

chrome/renderer/localized_error.h

Index: chrome/renderer/localized_error.h
diff --git a/chrome/renderer/localized_error.h b/chrome/renderer/localized_error.h
index 1006ae6a7d345259cc5955170b6fa7c90271bb11..0ccf86d543ffbc4b2cccb96c2f523635b3cb2de6 100644
--- a/chrome/renderer/localized_error.h
+++ b/chrome/renderer/localized_error.h
@@ -11,13 +11,16 @@
 #include "base/basictypes.h"
 #include "base/string16.h"
 
-class Extension;
 class GURL;
 
 namespace base {
 class DictionaryValue;
 }
 
+namespace extensions {
+class Extension;
+}
+
 namespace WebKit {
 struct WebURLError;
 }
@@ -48,7 +51,7 @@ class LocalizedError {
   // part of the app.
   static void GetAppErrorStrings(const WebKit::WebURLError& error,
                                  const GURL& display_url,
-                                 const Extension* app,
+                                 const extensions::Extension* app,
                                  base::DictionaryValue* error_strings);
 
   static const char kHttpErrorDomain[];