Fixed all unused-variable Clang warnings on Windows.

content/child/npapi/webplugin_delegate_impl_win.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/child/npapi/webplugin_delegate_impl.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 25 matching lines @@
 
 using blink::WebKeyboardEvent;
 using blink::WebInputEvent;
 using blink::WebMouseEvent;
 
 namespace content {
 
 namespace {
 
 const wchar_t kWebPluginDelegateProperty[] = L"WebPluginDelegateProperty";
-const wchar_t kPluginFlashThrottle[] = L"FlashThrottle";
 
 // The fastest we are willing to process WM_USER+1 events for Flash.
 // Flash can easily exceed the limits of our CPU if we don't throttle it.
 // The throttle has been chosen by testing various delays and compromising
 // on acceptable Flash performance and reasonable CPU consumption.
 //
 // I'd like to make the throttle delay variable, based on the amount of
 // time currently required to paint Flash plugins.  There isn't a good
 // way to count the time spent in aggregate plugin painting, however, so
 // this seems to work well enough.
@@ skipping 1423 matching lines @@
     case WM_RBUTTONUP:
       ::ReleaseCapture();
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace content