Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

content/renderer/speech_recognition_dispatcher.cc

 // Copyright (c) 2012 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/speech_recognition_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/speech_recognition_messages.h"
 #include "content/renderer/render_view_impl.h"
@@ skipping 81 matching lines @@
   // Each new session should reinstantiate the provider once the track is ready.
   ResetAudioSink();
 #endif
 
   SpeechRecognitionHostMsg_StartRequest_Params msg_params;
   for (size_t i = 0; i < params.grammars().size(); ++i) {
     const WebSpeechGrammar& grammar = params.grammars()[i];
     msg_params.grammars.push_back(
         SpeechRecognitionGrammar(grammar.src().spec(), grammar.weight()));
   }
-  msg_params.language = base::UTF16ToUTF8(params.language());
+  msg_params.language =
+      base::UTF16ToUTF8(base::StringPiece16(params.language()));
   msg_params.max_hypotheses = static_cast<uint32>(params.maxAlternatives());
   msg_params.continuous = params.continuous();
   msg_params.interim_results = params.interimResults();
   msg_params.origin_url = params.origin().toString().utf8();
   msg_params.render_view_id = routing_id();
   msg_params.request_id = GetOrCreateIDForHandle(handle);
 #if defined(ENABLE_WEBRTC)
   // Fall back to default input when the track is not allowed.
   msg_params.using_audio_track = !audio_track_.isNull();
 #else
@@ skipping 198 matching lines @@
 }
 
 const WebSpeechRecognitionHandle& SpeechRecognitionDispatcher::GetHandleFromID(
     int request_id) {
   HandleMap::iterator iter = handle_map_.find(request_id);
   CHECK(iter != handle_map_.end());
   return iter->second;
 }
 
 }  // namespace content