Make zoom using ctrl+mouse wheel work in win aura. Windows -non-aura had a hack that was a layering…

content/browser/renderer_host/render_widget_host_delegate.cc

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 
 namespace content {
 
 bool RenderWidgetHostDelegate::PreHandleKeyboardEvent(
     const NativeWebKeyboardEvent& event,
     bool* is_keyboard_shortcut) {
   return false;
 }
 
+bool RenderWidgetHostDelegate::PreHandleWheelEvent(
+    const WebKit::WebMouseWheelEvent& event) {
+  return false;
+}
+
 }  // namespace content