Don't pass NCMOUSEMOVE to RenderWidgetHostViewAura

content/browser/renderer_host/render_widget_host_view_aura.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_view_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 118 matching lines @@
        ++i) {
     event->touches[i] = event->touches[i + 1];
   }
 }
 
 bool CanRendererHandleEvent(const ui::MouseEvent* event) {
   if (event->type() == ui::ET_MOUSE_CAPTURE_CHANGED)
     return false;
 
 #if defined(OS_WIN)
-  // Renderer cannot handle WM_XBUTTON events.
+  // Renderer cannot handle WM_XBUTTON or NC events.
   switch (event->native_event().message) {
     case WM_XBUTTONDOWN:
     case WM_XBUTTONUP:
     case WM_XBUTTONDBLCLK:
+    case WM_NCMOUSEMOVE:
     case WM_NCXBUTTONDOWN:
     case WM_NCXBUTTONUP:
     case WM_NCXBUTTONDBLCLK:
       return false;
     default:
       break;
   }
 #endif
   return true;
 }
@@ skipping 1877 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content