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

content/browser/speech/google_one_shot_remote_engine_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 "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/speech/audio_buffer.h"
 #include "content/browser/speech/google_one_shot_remote_engine.h"
 #include "content/public/common/speech_recognition_error.h"
 #include "content/public/common/speech_recognition_result.h"
@@ skipping 86 matching lines @@
   EXPECT_EQ(0.9, result().hypotheses[0].confidence);
   EXPECT_EQ(ASCIIToUTF16("123456"), result().hypotheses[1].utterance);
   EXPECT_EQ(0.5, result().hypotheses[1].confidence);
 
   // Zero results.
   CreateAndTestRequest(true, "{\"status\":0,\"hypotheses\":[]}");
   EXPECT_EQ(error_, SPEECH_RECOGNITION_ERROR_NONE);
   EXPECT_EQ(0U, result().hypotheses.size());
 
   // Http failure case.
-  CreateAndTestRequest(false, "");
+  CreateAndTestRequest(false, std::string());
   EXPECT_EQ(error_, SPEECH_RECOGNITION_ERROR_NETWORK);
   EXPECT_EQ(0U, result().hypotheses.size());
 
   // Invalid status case.
   CreateAndTestRequest(true, "{\"status\":\"invalid\",\"hypotheses\":[]}");
   EXPECT_EQ(error_, SPEECH_RECOGNITION_ERROR_NETWORK);
   EXPECT_EQ(0U, result().hypotheses.size());
 
   // Server-side error case.
   CreateAndTestRequest(true, "{\"status\":1,\"hypotheses\":[]}");
   EXPECT_EQ(error_, SPEECH_RECOGNITION_ERROR_NETWORK);
   EXPECT_EQ(0U, result().hypotheses.size());
 
   // Malformed JSON case.
   CreateAndTestRequest(true, "{\"status\":0,\"hypotheses\":"
       "[{\"unknownkey\":\"hello\"}]}");
   EXPECT_EQ(error_, SPEECH_RECOGNITION_ERROR_NETWORK);
   EXPECT_EQ(0U, result().hypotheses.size());
 }
 
 }  // namespace content