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

chrome/browser/net/http_pipelining_compatibility_client_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/net/http_pipelining_compatibility_client.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 100 matching lines @@
     BrowserThread::ReleaseSoon(BrowserThread::IO, FROM_HERE, context_);
     message_loop_.RunUntilIdle();
     STLDeleteValues(&original_samples_);
   }
 
   void RunTest(
       std::vector<RequestInfo> requests,
       HttpPipeliningCompatibilityClient::Options options) {
     HttpPipeliningCompatibilityClient client(NULL);
     net::TestCompletionCallback callback;
-    client.Start(test_server_.GetURL("").spec(),
-                 requests, options, callback.callback(),
+    client.Start(test_server_.GetURL(std::string()).spec(),
+                 requests,
+                 options,
+                 callback.callback(),
                  context_->GetURLRequestContext());
     callback.WaitForResult();
   }
 
   void ExpectHistogramCount(int expected_count,
                             int expected_value,
                             HistogramField field) {
     const char* name;
 
     switch (field) {
@@ skipping 453 matching lines @@
   callback.WaitForResult();
 
   ExpectHistogramCount(1, false, FIELD_CANARY);
   ExpectHistogramCount(0, false, FIELD_SUCCESS);
   ExpectHistogramCount(0, true, FIELD_SUCCESS);
 }
 
 }  // anonymous namespace
 
 }  // namespace chrome_browser_net