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

content/browser/web_contents/web_contents_impl.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/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 1302 matching lines @@
     bool* is_keyboard_shortcut) {
   return delegate_ &&
       delegate_->PreHandleKeyboardEvent(this, event, is_keyboard_shortcut);
 }
 
 void WebContentsImpl::HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {
   if (delegate_)
     delegate_->HandleKeyboardEvent(this, event);
 }
 
+bool WebContentsImpl::PreHandleWheelEvent(
+    const WebKit::WebMouseWheelEvent& event) {
+  if (delegate_ &&
+      event.wheelTicksY &&
+      (event.modifiers & WebKit::WebInputEvent::ControlKey)) {
+    delegate_->ContentsZoomChange(event.wheelTicksY > 0);
+    return true;
+  }
+
+  return false;
+}
+
 void WebContentsImpl::HandleMouseDown() {
   if (delegate_)
     delegate_->HandleMouseDown();
 }
 
 void WebContentsImpl::HandleMouseUp() {
   if (delegate_)
     delegate_->HandleMouseUp();
 }
 
@@ skipping 2159 matching lines @@
 
 BrowserPluginGuest* WebContentsImpl::GetBrowserPluginGuest() const {
   return browser_plugin_guest_.get();
 }
 
 BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() const {
   return browser_plugin_embedder_.get();
 }
 
 }  // namespace content