Make ExtensionPrefValueMap a ProfileKeyedService.

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 446b5081ec35e5c62460a5cdd76976dbce576c4b..84a974eda33161dc7ae419c51cfc178761bc13d2 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -23,7 +23,6 @@ class ChromeAppCacheService;
 class ChromeURLDataManager;
 class Extension;
 class ExtensionEventRouter;
-class ExtensionPrefValueMap;
 class ExtensionProcessManager;
 class ExtensionService;
 class ExtensionSpecialStoragePolicy;
@@ -207,10 +206,6 @@ class Profile : public content::BrowserContext {
   // that this method is called.
   virtual VisitedLinkMaster* GetVisitedLinkMaster() = 0;
 
-  // Accessor. The instance is created upon first access.
-  // TODO(yoz): make this a ProfileKeyedService.
-  virtual ExtensionPrefValueMap* GetExtensionPrefValueMap() = 0;
-
   // DEPRECATED. Instead, use ExtensionSystem::extension_service().
   // Retrieves a pointer to the ExtensionService associated with this
   // profile. The ExtensionService is created at startup.