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

chrome/browser/google_apis/base_operations_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 "chrome/browser/google_apis/base_operations.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/values.h"
@@ skipping 48 matching lines @@
 
   void GetDataCallback(GDataErrorCode error, scoped_ptr<base::Value> value) {
     get_data_result_error_ = error;
     get_data_result_value_ = value.Pass();
     get_data_callback_called_ = true;
   }
 
   virtual void SetUp() OVERRIDE {
     profile_.reset(new TestingProfile);
     runner_.reset(new OperationRunner(profile_.get(),
-                                      NULL  /* url_request_context_getter */,
-                                      std::vector<std::string>()  /* scopes */,
-                                      ""  /* custom user agent */));
+                                      NULL /* url_request_context_getter */,
+                                      std::vector<std::string>() /* scopes */,
+                                      std::string() /* custom user agent */));
     runner_->Initialize();
     LOG(ERROR) << "Initialized.";
   }
 
   MessageLoopForUI message_loop_;
   content::TestBrowserThread ui_thread_;
   scoped_ptr<TestingProfile> profile_;
   scoped_ptr<OperationRunner> runner_;
 
   // Following members stores data returned with callbacks to be verified
@@ skipping 66 matching lines @@
   // Should wait for a blocking pool task, as the JSON parsing is done in the
   // blocking pool.
   test_util::RunBlockingPoolTask();
 
   ASSERT_TRUE(get_data_callback_called_);
   ASSERT_EQ(GDATA_PARSE_ERROR, get_data_result_error_);
   ASSERT_FALSE(get_data_result_value_.get());
 }
 
 }  // namespace google_apis