Enable MSVC warning for unused locals.

ui/views/win/hwnd_message_handler.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/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <oleacc.h>
 #include <shellapi.h>
 #include <wtsapi32.h>
@@ skipping 129 matching lines @@
   return CallNextHookEx(instance_->mouse_hook_, n_code, w_param, l_param);
 }
 
 // static
 LRESULT CALLBACK MoveLoopMouseWatcher::KeyHook(int n_code,
                                                WPARAM w_param,
                                                LPARAM l_param) {
   if (n_code == HC_ACTION && w_param == VK_ESCAPE) {
     if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
       int value = TRUE;
-      HRESULT result = DwmSetWindowAttribute(
-          instance_->host_->hwnd(),
-          DWMWA_TRANSITIONS_FORCEDISABLED,
-          &value,
-          sizeof(value));
+      DwmSetWindowAttribute(instance_->host_->hwnd(),
+                            DWMWA_TRANSITIONS_FORCEDISABLED,
+                            &value,
+                            sizeof(value));
     }
     if (instance_->hide_on_escape_)
       instance_->host_->Hide();
   }
   return CallNextHookEx(instance_->key_hook_, n_code, w_param, l_param);
 }
 
 // Called from OnNCActivate.
 BOOL CALLBACK EnumChildWindowsForRedraw(HWND hwnd, LPARAM lparam) {
   DWORD process_id;
@@ skipping 962 matching lines @@
   if ((window_ex_style() & WS_EX_COMPOSITED) == 0 && !custom_window_region_ &&
       (!delegate_->IsUsingCustomFrame() || !delegate_->IsWidgetWindow())) {
     if (force)
       SetWindowRgn(hwnd(), NULL, redraw);
     return;
   }
 
   // Changing the window region is going to force a paint. Only change the
   // window region if the region really differs.
   base::win::ScopedRegion current_rgn(CreateRectRgn(0, 0, 0, 0));
-  int current_rgn_result = GetWindowRgn(hwnd(), current_rgn);
+  GetWindowRgn(hwnd(), current_rgn);
 
   RECT window_rect;
   GetWindowRect(hwnd(), &window_rect);
   base::win::ScopedRegion new_region;
   if (custom_window_region_) {
     new_region.Set(::CreateRectRgn(0, 0, 0, 0));
     ::CombineRgn(new_region, custom_window_region_.Get(), NULL, RGN_COPY);
   } else if (IsMaximized()) {
     HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTONEAREST);
     MONITORINFO mi;
@@ skipping 1350 matching lines @@
     SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_HIDEWINDOW);
     SetWindowPos(hwnd(), NULL, 0, 0, 0, 0, flags | SWP_SHOWWINDOW);
   }
   // WM_DWMCOMPOSITIONCHANGED is only sent to top level windows, however we want
   // to notify our children too, since we can have MDI child windows who need to
   // update their appearance.
   EnumChildWindows(hwnd(), &SendDwmCompositionChanged, NULL);
 }
 
 }  // namespace views