Cleanup: Pass std::string as const reference from content/

content/browser/speech/speech_recognizer_impl_android.cc

 // Copyright 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/browser/speech/speech_recognizer_impl_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 33 matching lines @@
       base::Unretained(listener()),
       session_id()));
   SpeechRecognitionSessionConfig config =
       SpeechRecognitionManager::GetInstance()->GetSessionConfig(session_id());
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
       &content::SpeechRecognizerImplAndroid::StartRecognitionOnUIThread, this,
       config.language, config.continuous, config.interim_results));
 }
 
 void SpeechRecognizerImplAndroid::StartRecognitionOnUIThread(
-    std::string language, bool continuous, bool interim_results) {
+    const std::string& language,
+    bool continuous,
+    bool interim_results) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   JNIEnv* env = AttachCurrentThread();
   j_recognition_.Reset(Java_SpeechRecognition_createSpeechRecognition(env,
       GetApplicationContext(), reinterpret_cast<intptr_t>(this)));
   Java_SpeechRecognition_startRecognition(env, j_recognition_.obj(),
       ConvertUTF8ToJavaString(env, language).obj(), continuous,
       interim_results);
 }
 
 void SpeechRecognizerImplAndroid::AbortRecognition() {
@@ skipping 132 matching lines @@
   state_ = STATE_IDLE;
   listener()->OnRecognitionEnd(session_id());
 }
 
 // static
 bool SpeechRecognizerImplAndroid::RegisterSpeechRecognizer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content