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.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
===================================================================
--- content/browser/renderer_host/render_widget_host_delegate.h	(revision 180972)
+++ content/browser/renderer_host/render_widget_host_delegate.h	(working copy)
@@ -7,6 +7,10 @@
 
 #include "content/common/content_export.h"
 
+namespace WebKit {
+class WebMouseWheelEvent;
+}
+
 namespace content {
 
 class RenderWidgetHostImpl;
@@ -35,6 +39,11 @@
   // event (used for keyboard shortcuts).
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {}
 
+  // Callback to give the browser a chance to handle the specified mouse wheel
+  // event before sending it to the renderer.
+  // Returns true if the |event| was handled.
+  virtual bool PreHandleWheelEvent(const WebKit::WebMouseWheelEvent& event);
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };