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

chrome/browser/extensions/api/content_settings/content_settings_helpers.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/extensions/api/content_settings/content_settings_helpers.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/common/url_constants.h"
@@ skipping 30 matching lines @@
                CONTENT_SETTING_NUM_SETTINGS,
                content_setting_names_size_invalid);
 
 // TODO(bauerb): Move this someplace where it can be reused.
 std::string GetDefaultPort(const std::string& scheme) {
   if (scheme == chrome::kHttpScheme)
     return "80";
   if (scheme == chrome::kHttpsScheme)
     return "443";
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 }  // namespace
 
 namespace extensions {
 namespace content_settings_helpers {
 
 ContentSettingsPattern ParseExtensionPattern(const std::string& pattern_str,
                                              std::string* error) {
   const int kAllowedSchemes =
@@ skipping 78 matching lines @@
 }
 
 const char* ContentSettingToString(ContentSetting setting) {
   size_t index = static_cast<size_t>(setting);
   DCHECK_LT(index, arraysize(kContentSettingNames));
   return kContentSettingNames[index];
 }
 
 }  // namespace content_settings_helpers
 }  // namespace extensions