Disabled pinch zooming in non-browser Aura windows.

ui/web_dialogs/web_dialog_web_contents_delegate.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 UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_
 #define UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/web_dialogs/web_dialogs_export.h"
@@ skipping 38 matching lines @@
 
   // Calling this causes all following events sent from the
   // WebContents object to be ignored.  It also makes all following
   // calls to browser_context() return NULL.
   void Detach();
 
   // content::WebContentsDelegate declarations.
   virtual content::WebContents* OpenURLFromTab(
       content::WebContents* source,
       const content::OpenURLParams& params) OVERRIDE;
-
   virtual void AddNewContents(content::WebContents* source,
                               content::WebContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture,
                               bool* was_blocked) OVERRIDE;
   virtual bool IsPopupOrPanel(
       const content::WebContents* source) const OVERRIDE;
+  virtual bool PreHandleGestureEvent(
+      content::WebContents* source,
+      const blink::WebGestureEvent& event) OVERRIDE;
 
  private:
   // Weak pointer.  Always an original profile.
   content::BrowserContext* browser_context_;
 
   scoped_ptr<WebContentsHandler> handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDialogWebContentsDelegate);
 };
 
 }  // namespace ui
 
 #endif  // UI_WEB_DIALOGS_WEB_DIALOG_WEB_CONTENTS_DELEGATE_H_