Update uses of UTF conversions in content/ to use the base:: namespace.

content/renderer/media/rtc_dtmf_sender_handler.cc

 // Copyright (c) 2013 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 "content/renderer/media/rtc_dtmf_sender_handler.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 13 matching lines @@
   DVLOG(1) << "::dtor";
   dtmf_sender_->UnregisterObserver();
 }
 
 void RtcDtmfSenderHandler::setClient(
     blink::WebRTCDTMFSenderHandlerClient* client) {
   webkit_client_ = client;
 }
 
 blink::WebString RtcDtmfSenderHandler::currentToneBuffer() {
-  return UTF8ToUTF16(dtmf_sender_->tones());
+  return base::UTF8ToUTF16(dtmf_sender_->tones());
 }
 
 bool RtcDtmfSenderHandler::canInsertDTMF() {
   return dtmf_sender_->CanInsertDtmf();
 }
 
 bool RtcDtmfSenderHandler::insertDTMF(const blink::WebString& tones,
                                       long duration,
                                       long interToneGap) {
-  std::string utf8_tones = UTF16ToUTF8(tones);
+  std::string utf8_tones = base::UTF16ToUTF8(tones);
   return dtmf_sender_->InsertDtmf(utf8_tones, static_cast<int>(duration),
                                   static_cast<int>(interToneGap));
 }
 
 void RtcDtmfSenderHandler::OnToneChange(const std::string& tone) {
   if (!webkit_client_) {
     LOG(ERROR) << "WebRTCDTMFSenderHandlerClient not set.";
     return;
   }
-  webkit_client_->didPlayTone(UTF8ToUTF16(tone));
+  webkit_client_->didPlayTone(base::UTF8ToUTF16(tone));
 }
 
 }  // namespace content