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

chrome/browser/extensions/api/declarative_content/content_rules_registry.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/declarative_content/content_rules_registry.h"
 
 #include "chrome/browser/extensions/api/declarative_content/content_action.h"
 #include "chrome/browser/extensions/api/declarative_content/content_condition.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
@@ skipping 158 matching lines @@
   // Register url patterns in url_matcher_.
   URLMatcherConditionSet::Vector all_new_condition_sets;
   for (RulesMap::iterator i = new_content_rules.begin();
        i != new_content_rules.end(); ++i) {
     i->second->conditions().GetURLMatcherConditionSets(&all_new_condition_sets);
   }
   url_matcher_.AddConditionSets(all_new_condition_sets);
 
   UpdateConditionCache();
 
-  return "";
+  return std::string();
 }
 
 std::string ContentRulesRegistry::RemoveRulesImpl(
     const std::string& extension_id,
     const std::vector<std::string>& rule_identifiers) {
   // URLMatcherConditionSet IDs that can be removed from URLMatcher.
   std::vector<URLMatcherConditionSet::ID> remove_from_url_matcher;
 
   for (std::vector<std::string>::const_iterator i = rule_identifiers.begin();
        i != rule_identifiers.end(); ++i) {
@@ skipping 24 matching lines @@
 
     // Remove reference to actual rule.
     content_rules_.erase(content_rules_entry);
   }
 
   // Clear URLMatcher based on condition_set_ids that are not needed any more.
   url_matcher_.RemoveConditionSets(remove_from_url_matcher);
 
   UpdateConditionCache();
 
-  return "";
+  return std::string();
 }
 
 std::string ContentRulesRegistry::RemoveAllRulesImpl(
     const std::string& extension_id) {
   // Search all identifiers of rules that belong to extension |extension_id|.
   std::vector<std::string> rule_identifiers;
   for (RulesMap::iterator i = content_rules_.begin();
        i != content_rules_.end(); ++i) {
     const ContentRule::GlobalRuleId& global_rule_id = i->first;
     if (global_rule_id.first == extension_id)
@@ skipping 51 matching lines @@
 
 base::Time ContentRulesRegistry::GetExtensionInstallationTime(
     const std::string& extension_id) const {
   if (!extension_info_map_.get())  // May be NULL during testing.
     return base::Time();
 
   return extension_info_map_->GetInstallTime(extension_id);
 }
 
 }  // namespace extensions