Rewrite std::string("") to std::string(), Linux edition.

content/browser/speech/speech_recognizer_unittest.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 <vector>
 
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/speech/google_one_shot_remote_engine.h"
 #include "content/browser/speech/speech_recognizer.h"
 #include "content/public/browser/speech_recognition_event_listener.h"
@@ skipping 287 matching lines @@
   EXPECT_FALSE(result_received_);
   EXPECT_EQ(SPEECH_RECOGNITION_ERROR_NONE, error_);
 
   // Issue the network callback to complete the process.
   fetcher->set_url(fetcher->GetOriginalURL());
   net::URLRequestStatus status;
   status.set_status(net::URLRequestStatus::FAILED);
   status.set_error(net::ERR_CONNECTION_REFUSED);
   fetcher->set_status(status);
   fetcher->set_response_code(0);
-  fetcher->SetResponseString("");
+  fetcher->SetResponseString(std::string());
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   MessageLoop::current()->RunUntilIdle();
   EXPECT_TRUE(recognition_ended_);
   EXPECT_FALSE(result_received_);
   EXPECT_EQ(SPEECH_RECOGNITION_ERROR_NETWORK, error_);
   CheckFinalEventsConsistency();
 }
 
 TEST_F(SpeechRecognizerTest, ServerError) {
   // Start recording, give some data and then stop. Issue the network callback
@@ skipping 169 matching lines @@
 
   EXPECT_EQ(SPEECH_RECOGNITION_ERROR_NONE, error_);
   EXPECT_FALSE(audio_ended_);
   EXPECT_FALSE(recognition_ended_);
   recognizer_->AbortRecognition();
   MessageLoop::current()->RunUntilIdle();
   CheckFinalEventsConsistency();
 }
 
 }  // namespace content