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

chrome/browser/search_engines/template_url_prepopulate_data_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/command_line.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_vector.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
@@ skipping 149 matching lines @@
             t_urls[0]->alternate_urls()[0]);
   EXPECT_EQ("espv", t_urls[0]->search_terms_replacement_key());
 
   // Test that subsequent providers are loaded even if an intermediate
   // provider has an incomplete configuration.
   overrides = new ListValue;
   overrides->Append(entry->DeepCopy());
   entry->SetInteger("id", 1002);
   entry->SetString("name", "bar");
   entry->SetString("keyword", "bark");
-  entry->SetString("encoding", "");
+  entry->SetString("encoding", std::string());
   overrides->Append(entry->DeepCopy());
   entry->SetInteger("id", 1003);
   entry->SetString("name", "baz");
   entry->SetString("keyword", "bazk");
   entry->SetString("encoding", "UTF-8");
   overrides->Append(entry->DeepCopy());
   prefs->SetUserPref(prefs::kSearchProviderOverrides, overrides);
 
   t_urls.clear();
   TemplateURLPrepopulateData::GetPrepopulatedEngines(&profile, &t_urls.get(),
@@ skipping 114 matching lines @@
 
 TEST(TemplateURLPrepopulateDataTest, GetLogoURLInvalid) {
   TemplateURLData data;
   data.SetURL("http://invalid:search:url/");
   TemplateURL turl(NULL, data);
   GURL logo_url = TemplateURLPrepopulateData::GetLogoURL(
       turl, TemplateURLPrepopulateData::LOGO_100_PERCENT);
 
   EXPECT_TRUE(logo_url.is_empty());
 }