Use explicit WebString conversions in remaining content files

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 <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 90 matching lines @@
   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().string().utf8(),
                                  grammar.weight()));
   }
-  msg_params.language =
-      base::UTF16ToUTF8(base::StringPiece16(params.language()));
+  msg_params.language = params.language().utf8();
   msg_params.max_hypotheses = static_cast<uint32_t>(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 BUILDFLAG(ENABLE_WEBRTC)
   // Fall back to default input when the track is not allowed.
   msg_params.using_audio_track = !audio_track_.isNull();
 #else
@@ skipping 123 matching lines @@
   int provisional_index = 0, final_index = 0;
   for (it = results.begin(); it != results.end(); ++it) {
     const SpeechRecognitionResult& result = (*it);
     WebSpeechRecognitionResult* webkit_result = result.is_provisional ?
         &provisional[provisional_index++] : &final[final_index++];
 
     const size_t num_hypotheses = result.hypotheses.size();
     WebVector<WebString> transcripts(num_hypotheses);
     WebVector<float> confidences(num_hypotheses);
     for (size_t i = 0; i < num_hypotheses; ++i) {
-      transcripts[i] = result.hypotheses[i].utterance;
+      transcripts[i] = WebString::fromUTF16(result.hypotheses[i].utterance);
       confidences[i] = static_cast<float>(result.hypotheses[i].confidence);
     }
     webkit_result->assign(transcripts, confidences, !result.is_provisional);
   }
 
   recognizer_client_->didReceiveResults(
       GetHandleFromID(request_id), final, provisional);
 }
 
 void SpeechRecognitionDispatcher::OnAudioReceiverReady(
@@ skipping 54 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