Move Extension into extensions namespace

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 a08a48b2aa6fcdaac6b5ed31c207908fc8a564e5..8d75eeede19db895948d91a5572efbde2a9023d4 100644
--- a/chrome/browser/profiles/profile.h
+++ b/chrome/browser/profiles/profile.h
@@ -21,7 +21,6 @@ class AutocompleteClassifier;
 class BookmarkModel;
 class ChromeAppCacheService;
 class ChromeURLDataManager;
-class Extension;
 class ExtensionEventRouter;
 class ExtensionProcessManager;
 class ExtensionService;
@@ -39,28 +38,29 @@ class UserScriptMaster;
 class VisitedLinkMaster;
 class WebDataService;
 
+namespace android {
+class TabContentsProvider;
+}
+
 namespace base {
 class Time;
 }
 
+namespace chrome_browser_net {
+class Predictor;
+}
+
 namespace chromeos {
 class LibCrosServiceLibraryImpl;
 class ResetDefaultProxyConfigServiceTask;
 }
 
-namespace chrome_browser_net {
-class Predictor;
-}
 
 namespace content {
 class SpeechRecognitionPreferences;
 class WebUI;
 }
 
-namespace android {
-class TabContentsProvider;
-}
-
 namespace fileapi {
 class FileSystemContext;
 }