Misc. cleanup, primarily removing unused locals.

ui/gfx/win/hwnd_util.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/gfx/win/hwnd_util.h"
 
 #include "base/i18n/rtl.h"
 #include "base/strings/string_util.h"
 #include "base/win/metro.h"
 #include "base/win/win_util.h"
@@ skipping 94 matching lines @@
 }
 
 void* SetWindowUserData(HWND hwnd, void* user_data) {
   return
       reinterpret_cast<void*>(SetWindowLongPtr(hwnd, GWLP_USERDATA,
           reinterpret_cast<LONG_PTR>(user_data)));
 }
 
 void* GetWindowUserData(HWND hwnd) {
   DWORD process_id = 0;
-  DWORD thread_id = GetWindowThreadProcessId(hwnd, &process_id);
+  GetWindowThreadProcessId(hwnd, &process_id);
   // A window outside the current process needs to be ignored.
   if (process_id != ::GetCurrentProcessId())
     return NULL;
   return reinterpret_cast<void*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
 }
 
 #pragma warning(pop)
 
 bool DoesWindowBelongToActiveWindow(HWND window) {
   DCHECK(window);
@@ skipping 110 matching lines @@
   HMODULE metro = base::win::GetMetroModule();
   if (!metro)
     return get_real_hwnd ? ::GetDesktopWindow() : HWND_DESKTOP;
   // In windows 8 metro-mode the root window is not the desktop.
   RootWindow root_window =
       reinterpret_cast<RootWindow>(::GetProcAddress(metro, "GetRootWindow"));
   return root_window();
 }
 
 }  // namespace gfx