Add ExtensionSytem::Get(Profile*) as a wrapper around

chrome/browser/profiles/profile.h

Index: chrome/browser/profiles/profile.h
diff --git a/chrome/browser/profiles/profile.h b/chrome/browser/profiles/profile.h
index 19a1357522a2e14a9395212aeceb4062b844fc89..446b5081ec35e5c62460a5cdd76976dbce576c4b 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -211,26 +211,26 @@ class Profile : public content::BrowserContext {
   // TODO(yoz): make this a ProfileKeyedService.
   virtual ExtensionPrefValueMap* GetExtensionPrefValueMap() = 0;
 
-  // DEPRECATED. Instead, use ExtensionSystemFactory::extension_service().
+  // DEPRECATED. Instead, use ExtensionSystem::extension_service().
   // Retrieves a pointer to the ExtensionService associated with this
   // profile. The ExtensionService is created at startup.
   // TODO(yoz): remove this accessor (bug 104095).
   virtual ExtensionService* GetExtensionService() = 0;
 
-  // DEPRECATED. Instead, use ExtensionSystemFactory::user_script_master().
+  // DEPRECATED. Instead, use ExtensionSystem::user_script_master().
   // Retrieves a pointer to the UserScriptMaster associated with this
   // profile.  The UserScriptMaster is lazily created the first time
   // that this method is called.
   // TODO(yoz): remove this accessor (bug 104095).
   virtual UserScriptMaster* GetUserScriptMaster() = 0;
 
-  // DEPRECATED. Instead, use ExtensionSystemFactory::process_manager().
+  // DEPRECATED. Instead, use ExtensionSystem::process_manager().
   // Retrieves a pointer to the ExtensionProcessManager associated with this
   // profile.  The instance is created at startup.
   // TODO(yoz): remove this accessor (bug 104095).
   virtual ExtensionProcessManager* GetExtensionProcessManager() = 0;
 
-  // DEPRECATED. Instead, use ExtensionSystemFactory::event_router().
+  // DEPRECATED. Instead, use ExtensionSystem::event_router().
   // Accessor. The instance is created at startup.
   // TODO(yoz): remove this accessor (bug 104095).
   virtual ExtensionEventRouter* GetExtensionEventRouter() = 0;