Move Extension into extensions namespace

chrome/browser/ui/cocoa/extensions/browser_actions_controller.h

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
index 02a26d949d2ea879e55ad6583c6841c81d07e7d4..59001cd1bded8ff0dc1fad49b3b68a08be58def5 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
@@ -14,7 +14,6 @@
 class Browser;
 @class BrowserActionButton;
 @class BrowserActionsContainerView;
-class Extension;
 @class ExtensionPopupController;
 class ExtensionToolbarModel;
 class ExtensionServiceObserverBridge;
@@ -22,6 +21,10 @@ class ExtensionServiceObserverBridge;
 class PrefService;
 class Profile;
 
+namespace extensions {
+class Extension;
+}
+
 // Sent when the visibility of the Browser Actions changes.
 extern NSString* const kBrowserActionVisibilityChangedNotification;
 
@@ -88,7 +91,8 @@ extern NSString* const kBrowserActionVisibilityChangedNotification;
 - (void)resizeContainerAndAnimate:(BOOL)animate;
 
 // Returns the NSView for the action button associated with an extension.
-- (NSView*)browserActionViewForExtension:(const Extension*)extension;
+- (NSView*)browserActionViewForExtension:(
+    const extensions::Extension*)extension;
 
 // Returns the saved width determined by the number of shown Browser Actions
 // preference property. If no preference is found, then the width for the
@@ -98,7 +102,7 @@ extern NSString* const kBrowserActionVisibilityChangedNotification;
 // Returns where the popup arrow should point to for a given Browser Action. If
 // it is passed an extension that is not a Browser Action, then it will return
 // NSZeroPoint.
-- (NSPoint)popupPointForBrowserAction:(const Extension*)extension;
+- (NSPoint)popupPointForBrowserAction:(const extensions::Extension*)extension;
 
 // Returns whether the chevron button is currently hidden or in the process of
 // being hidden (fading out). Will return NO if it is not hidden or is in the