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

content/browser/speech/speech_recognition_browsertest.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 <list>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
@@ skipping 73 matching lines @@
 
   void TestAudioControllerClosed(
       media::TestAudioInputController* controller) override {
     ASSERT_EQ(kClientAudioUpload, streaming_server_state_);
     streaming_server_state_ = kTestAudioControllerClosed;
     mock_streaming_server_->MockGoogleStreamingServer::SimulateResult(
         GetGoodSpeechResult());
   }
 
   // Helper methods used by test fixtures.
-  GURL GetTestUrlFromFragment(const std::string fragment) {
+  GURL GetTestUrlFromFragment(const std::string& fragment) {
     return GURL(GetTestUrl("speech", "web_speech_recognition.html").spec() +
         "#" + fragment);
   }
 
   std::string GetPageFragment() {
     return shell()->web_contents()->GetLastCommittedURL().ref();
   }
 
   const StreamingServerState &streaming_server_state() {
     return streaming_server_state_;
@@ skipping 97 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(SpeechRecognitionBrowserTest, OneShotRecognition) {
   NavigateToURLBlockUntilNavigationsComplete(
       shell(), GetTestUrlFromFragment("oneshot"), 2);
 
   EXPECT_EQ(kClientDisconnected, streaming_server_state());
   EXPECT_EQ("goodresult1", GetPageFragment());
 }
 
 }  // namespace content