[gtk] fix zoom bubble showing up on wrong window

content/browser/web_contents/web_contents_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 237 matching lines @@
   virtual base::TimeTicks GetNewTabStartTime() const OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void OnCloseStarted() OVERRIDE;
   virtual bool ShouldAcceptDragAndDrop() const OVERRIDE;
   virtual void SystemDragEnded() OVERRIDE;
   virtual void UserGestureDone() OVERRIDE;
   virtual void SetClosedByUserGesture(bool value) OVERRIDE;
   virtual bool GetClosedByUserGesture() const OVERRIDE;
   virtual double GetZoomLevel() const OVERRIDE;
   virtual int GetZoomPercent(bool* enable_increment,
-                             bool* enable_decrement) OVERRIDE;
+                             bool* enable_decrement) const OVERRIDE;
   virtual void ViewSource() OVERRIDE;
   virtual void ViewFrameSource(const GURL& url,
                                const std::string& content_state) OVERRIDE;
   virtual int GetMinimumZoomPercent() const OVERRIDE;
   virtual int GetMaximumZoomPercent() const OVERRIDE;
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual int GetContentRestrictions() const OVERRIDE;
   virtual content::WebUI::TypeID GetWebUITypeForCurrentState() OVERRIDE;
   virtual content::WebUI* GetWebUIForCurrentState() OVERRIDE;
   virtual bool GotResponseToLockMouseRequest(bool allowed) OVERRIDE;
@@ skipping 598 matching lines @@
   content::RenderViewHost* message_source_;
 
   // All live RenderWidgetHostImpls that are created by this object and may
   // outlive it.
   std::set<content::RenderWidgetHostImpl*> created_widgets_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
 };
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_