Enable MSVC warning for unused locals.

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 805 matching lines @@
   window_.width = window_rect_.width();
   window_.x = 0;
   window_.y = 0;
 
   window_.window = windowed_handle_;
   window_.type = NPWindowTypeWindow;
 
   // Reset this flag before entering the instance in case of side-effects.
   windowed_did_set_window_ = true;
 
-  NPError err = instance()->NPP_SetWindow(&window_);
+  instance()->NPP_SetWindow(&window_);
   if (quirks_ & PLUGIN_QUIRK_SETWINDOW_TWICE)
     instance()->NPP_SetWindow(&window_);
 
   WNDPROC current_wnd_proc = reinterpret_cast<WNDPROC>(
         GetWindowLongPtr(windowed_handle_, GWLP_WNDPROC));
   if (current_wnd_proc != NativeWndProc) {
     plugin_wnd_proc_ = reinterpret_cast<WNDPROC>(
         SetWindowLongPtr(windowed_handle_,
                          GWLP_WNDPROC,
                          reinterpret_cast<LONG_PTR>(NativeWndProc)));
@@ skipping 647 matching lines @@
     case WM_RBUTTONUP:
       ::ReleaseCapture();
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace content