Move Extension into extensions namespace

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

Index: chrome/browser/ui/cocoa/extensions/browser_action_button.h
diff --git a/chrome/browser/ui/cocoa/extensions/browser_action_button.h b/chrome/browser/ui/cocoa/extensions/browser_action_button.h
index e8bad88cb476a2c840f4a3243fe71aa576c79377..1b4ecebdf5d7d374346b1c54b88e4f203726b797 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_action_button.h
+++ b/chrome/browser/ui/cocoa/extensions/browser_action_button.h
@@ -12,11 +12,14 @@
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/gradient_button_cell.h"
 
-class Extension;
 class ExtensionAction;
 class ExtensionImageTrackerBridge;
 class Profile;
 
+namespace extensions {
+class Extension;
+}
+
 // Fired when the Browser Action's state has changed. Usually the image needs to
 // be updated.
 extern NSString* const kBrowserActionButtonUpdatedNotification;
@@ -42,7 +45,7 @@ extern NSString* const kBrowserActionButtonDragEndNotification;
   scoped_nsobject<NSViewAnimation> moveAnimation_;
 
   // The extension for this button. Weak.
-  const Extension* extension_;
+  const extensions::Extension* extension_;
 
   // The ID of the active tab.
   int tabId_;
@@ -57,7 +60,7 @@ extern NSString* const kBrowserActionButtonDragEndNotification;
 }
 
 - (id)initWithFrame:(NSRect)frame
-          extension:(const Extension*)extension
+          extension:(const extensions::Extension*)extension
             profile:(Profile*)profile
               tabId:(int)tabId;
 
@@ -76,7 +79,7 @@ extern NSString* const kBrowserActionButtonDragEndNotification;
 - (NSImage*)compositedImage;
 
 @property(readonly, nonatomic) BOOL isBeingDragged;
-@property(readonly, nonatomic) const Extension* extension;
+@property(readonly, nonatomic) const extensions::Extension* extension;
 @property(readwrite, nonatomic) int tabId;
 
 @end