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

media/capture/video/win/video_capture_device_factory_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 "media/capture/video/win/video_capture_device_factory_win.h"
 
 #include <mfapi.h>
 #include <mferror.h>
 
 #include "base/command_line.h"
@@ skipping 45 matching lines @@
               "kBlacklistedCameraNames should be same size as "
               "BlacklistedCameraNames enum");
 
 static bool LoadMediaFoundationDlls() {
   static const wchar_t* const kMfDLLs[] = {
       L"%WINDIR%\\system32\\mf.dll",
       L"%WINDIR%\\system32\\mfplat.dll",
       L"%WINDIR%\\system32\\mfreadwrite.dll",
   };
 
-  for (int i = 0; i < arraysize(kMfDLLs); ++i) {
+  for (const wchar_t* kMfDLL : kMfDLLs) {
     wchar_t path[MAX_PATH] = {0};
-    ExpandEnvironmentStringsW(kMfDLLs[i], path, arraysize(path));
+    ExpandEnvironmentStringsW(kMfDLL, path, arraysize(path));
     if (!LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH))
       return false;
   }
   return true;
 }
 
 static bool PrepareVideoCaptureAttributesMediaFoundation(
     IMFAttributes** attributes,
     int count) {
   InitializeMediaFoundation();
@@ skipping 348 matching lines @@
 }
 
 // static
 VideoCaptureDeviceFactory*
 VideoCaptureDeviceFactory::CreateVideoCaptureDeviceFactory(
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
   return new VideoCaptureDeviceFactoryWin();
 }
 
 }  // namespace media