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

chrome/browser/net/chrome_network_delegate_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/chrome_network_delegate.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/prefs/pref_member.h"
@@ skipping 216 matching lines @@
 
   CheckAddedParameters("http://google.com/?" + kSsuiParameter + "&q=goog&" +
                        kSafeParameter,
                        "q=goog&" + kBothParameters);
 
   CheckAddedParameters("http://google.com/?" + kSsuiParameter + "&" +
                        kSafeParameter + "&q=goog",
                        "q=goog&" + kBothParameters);
 
   // Test that another website is not affected, without parameters.
-  CheckAddedParameters("http://google.com/finance", "");
+  CheckAddedParameters("http://google.com/finance", std::string());
 
   // Test that another website is not affected, with parameters.
   CheckAddedParameters("http://google.com/finance?q=goog", "q=goog");
 
   // Test that another website is not affected with redirects, with parameters.
   CheckAddedParameters("http://finance.google.com/?q=goog", "q=goog");
 
   // Test with percent-encoded data (%26 is &)
   CheckAddedParameters("http://google.com/?q=%26%26%26&" + kSsuiParameter +
                        "&" + kSafeParameter + "&param=%26%26%26",
                        "q=%26%26%26&param=%26%26%26&" + kBothParameters);
 }
 
 TEST_F(ChromeNetworkDelegateSafeSearchTest, SafeSearchOff) {
   // Tests with SafeSearch settings off, delegate should not alter requests.
   SetSafeSearch(false);
   scoped_ptr<net::NetworkDelegate> delegate(CreateNetworkDelegate());
   SetDelegate(delegate.get());
 
   // Test the home page.
-  CheckAddedParameters("http://google.com/", "");
+  CheckAddedParameters("http://google.com/", std::string());
 
   // Test the search home page.
-  CheckAddedParameters("http://google.com/webhp", "");
+  CheckAddedParameters("http://google.com/webhp", std::string());
 
   // Test the home page with parameters.
   CheckAddedParameters("http://google.com/search?q=google",
                        "q=google");
 
   // Test the search page with parameters.
   CheckAddedParameters("http://google.com/?q=google",
                        "q=google");
 
   // Test the search webhp page with parameters.
   CheckAddedParameters("http://google.com/webhp?q=google",
                        "q=google");
 
   // Test the home page with parameters and safe set to off.
   CheckAddedParameters("http://google.com/search?q=google&safe=off",
                        "q=google&safe=off");
 
   // Test the home page with parameters and safe set to active.
   CheckAddedParameters("http://google.com/search?q=google&safe=active",
                        "q=google&safe=active");
 }