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

chrome/browser/browsing_data/browsing_data_cookie_helper_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/browsing_data/browsing_data_cookie_helper.h"
 
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 259 matching lines @@
 
   scoped_refptr<CannedBrowsingDataCookieHelper> helper(
       new CannedBrowsingDataCookieHelper(
           testing_profile_->GetRequestContext()));
 
   ASSERT_TRUE(helper->empty());
   helper->AddChangedCookie(origin, origin, "A=1", net::CookieOptions());
   helper->AddChangedCookie(origin, origin, "A=1; Domain=.www.google.com",
                            net::CookieOptions());
   // Try adding invalid cookies that will be ignored.
-  helper->AddChangedCookie(origin, origin, "", net::CookieOptions());
-  helper->AddChangedCookie(origin, origin, "C=bad guy; Domain=wrongdomain.com",
+  helper->AddChangedCookie(origin, origin, std::string(), net::CookieOptions());
+  helper->AddChangedCookie(origin,
+                           origin,
+                           "C=bad guy; Domain=wrongdomain.com",
                            net::CookieOptions());
 
   helper->StartFetching(
       base::Bind(&BrowsingDataCookieHelperTest::CannedDomainCookieCallback,
                  base::Unretained(this)));
   cookie = cookie_list_;
 
   helper->Reset();
   ASSERT_TRUE(helper->empty());
 
@@ skipping 187 matching lines @@
   //   "A=1;
   //   "A=3; Domain=www.google.com"
   // Add a domain cookie and check if it increases the cookie count.
   helper->AddChangedCookie(frame2_url, frame1_url,
                            cookie_pair4 + "; Domain=" + cookie_domain,
                            net::CookieOptions());
   EXPECT_EQ(5U, helper->GetCookieCount());
 }
 
 }  // namespace