Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

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/bind.h"
 #include "base/location.h"
@@ skipping 61 matching lines @@
   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 = base::UTF16ToUTF8(tones);
+  std::string utf8_tones = base::UTF16ToUTF8(base::StringPiece16(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(base::UTF8ToUTF16(tone));
 }
 
 }  // namespace content