Move the parsing of "chrome_url_overrides" out of Extension.

chrome/browser/extensions/manifest_url_parser.h

Index: chrome/browser/extensions/manifest_url_parser.h
diff --git a/chrome/browser/extensions/manifest_url_parser.h b/chrome/browser/extensions/manifest_url_parser.h
index b2d164acca6643d287fdb34914f049a40b8ee520..fb560954b90cd7c2779c627e3410d4718b7b4ddd 100644
--- a/chrome/browser/extensions/manifest_url_parser.h
+++ b/chrome/browser/extensions/manifest_url_parser.h
@@ -7,16 +7,24 @@
 
 #include "base/basictypes.h"
 #include "chrome/browser/extensions/api/profile_keyed_api_factory.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace extensions {
 
-class ManifestURLParser : public ProfileKeyedAPI {
+class ManifestURLParser : public ProfileKeyedAPI,
+                          public content::NotificationObserver {
  public:
   explicit ManifestURLParser(Profile* profile);
   virtual ~ManifestURLParser();
 
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
  private:
   friend class ProfileKeyedAPIFactory<ManifestURLParser>;
 
@@ -26,6 +34,9 @@ class ManifestURLParser : public ProfileKeyedAPI {
   }
   static const bool kServiceIsNULLWhileTesting = true;
 
+  Profile* const profile_;
+  content::NotificationRegistrar registrar_;
+
   DISALLOW_COPY_AND_ASSIGN(ManifestURLParser);
 };