Enable MSVC warning for unused locals.

ui/views/controls/menu/native_menu_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 "ui/views/controls/menu/native_menu_win.h"
 
 #include <Windowsx.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 264 matching lines @@
         // Manually render a checkbox.
         ui::NativeThemeWin* native_theme = ui::NativeThemeWin::instance();
         const MenuConfig& config = MenuConfig::instance(native_theme);
         NativeTheme::State state;
         if (draw_item_struct->itemState & ODS_DISABLED) {
           state = NativeTheme::kDisabled;
         } else {
           state = draw_item_struct->itemState & ODS_SELECTED ?
               NativeTheme::kHovered : NativeTheme::kNormal;
         }
-        int height =
-            draw_item_struct->rcItem.bottom - draw_item_struct->rcItem.top;
-        int icon_y = kItemTopMargin +
-            (height - kItemTopMargin - kItemBottomMargin -
-             config.check_height) / 2;

[Peter Kasting, 2014/11/18 00:41:03]

The DrawToNativeContext() call below does some calculations kind of like this,
but not exactly -- were they supposed to be using these variables?

         gfx::Canvas canvas(gfx::Size(config.check_width, config.check_height),
                            1.0f,
                            false);
         NativeTheme::ExtraParams extra;
         extra.menu_check.is_radio = false;
         gfx::Rect bounds(0, 0, config.check_width, config.check_height);
 
         // Draw the background and the check.
         native_theme->Paint(
             canvas.sk_canvas(), NativeTheme::kMenuCheckBackground,
@@ skipping 129 matching lines @@
   open_native_menu_win_ = this;
   HHOOK hhook = SetWindowsHookEx(WH_MSGFILTER, MenuMessageHook,
                                  GetModuleHandle(NULL), ::GetCurrentThreadId());
 
   // Mark that any registered listeners have not been called for this particular
   // opening of the menu.
   listeners_called_ = false;
 
   // Command dispatch is done through WM_MENUCOMMAND, handled by the host
   // window.
-  HWND hwnd = host_window_->hwnd();
   menu_to_select_ = NULL;
   position_to_select_ = -1;
   menu_to_select_factory_.InvalidateWeakPtrs();
   bool destroyed = false;
   destroyed_flag_ = &destroyed;
   model_->MenuWillShow();
   TrackPopupMenu(menu_, flags, point.x(), point.y(), 0, host_window_->hwnd(),
                  NULL);
   UnhookWindowsHookEx(hhook);
   open_native_menu_win_ = NULL;
@@ skipping 307 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // MenuWrapper, public:
 
 // static
 MenuWrapper* MenuWrapper::CreateWrapper(ui::MenuModel* model) {
   return new NativeMenuWin(model, NULL);
 }
 
 }  // namespace views