Use a direct include of strings headers in chrome/renderer/.

chrome/renderer/plugins/plugin_uma.cc

 // Copyright (c) 2011 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/renderer/plugins/plugin_uma.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/metrics/histogram.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "content/public/common/content_constants.h"
 #include "third_party/widevine/cdm/widevine_cdm_common.h"
 #include "webkit/plugins/plugin_constants.h"
 
 namespace {
 
 // String we will use to convert mime type to plugin type.
 const char kWindowsMediaPlayerType[] = "application/x-mplayer2";
 const char kSilverlightTypePrefix[] = "application/x-silverlight";
 const char kRealPlayerTypePrefix[] = "audio/x-pn-realaudio";
@@ skipping 175 matching lines @@
     return SHOCKWAVE_FLASH;
   }
 
 #if defined(ENABLE_PEPPER_CDMS)
   if (mime_type == kWidevineCdmPluginMimeType)
     return WIDEVINE_CDM;
 #endif
 
   return UNSUPPORTED_MIMETYPE;
 }