clang/win: Let remaining chromium_code targets build with -Wextra.

chrome/browser/web_applications/update_shortcut_worker_win.cc

 // Copyright 2014 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 "chrome/browser/web_applications/update_shortcut_worker_win.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 136 matching lines @@
       NULL
     }, {
       // For Win7, create_in_quick_launch_bar means pinning to taskbar.
       base::DIR_APP_DATA,
       (base::win::GetVersion() >= base::win::VERSION_WIN7) ?
           L"Microsoft\\Internet Explorer\\Quick Launch\\User Pinned\\TaskBar" :
           L"Microsoft\\Internet Explorer\\Quick Launch"
     }
   };
 
-  for (int i = 0; i < arraysize(locations); ++i) {
+  for (size_t i = 0; i < arraysize(locations); ++i) {
     base::FilePath path;
     if (!PathService::Get(locations[i].location_id, &path)) {
       NOTREACHED();
       continue;
     }
 
     if (locations[i].sub_dir != NULL)
       path = path.Append(locations[i].sub_dir);
 
     base::FilePath shortcut_file = path.Append(file_name_).
@@ skipping 70 matching lines @@
                  base::Unretained(this)));
   }
 }
 
 void UpdateShortcutWorker::DeleteMeOnUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   delete this;
 }
 
 }  // namespace web_app