Continue to clean c_str() calls.

chrome/browser/prefs/pref_metrics_service.cc

 // Copyright 2013 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/prefs/pref_metrics_service.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 190 matching lines @@
                  histogram_name_prefix, callback));
 }
 
 void PrefMetricsService::OnPrefChanged(
     const std::string& histogram_name_prefix,
     const LogHistogramValueCallback& callback,
     const std::string& path,
     bool from_sync) {
   sync_preferences::PrefServiceSyncable* prefs =
       PrefServiceSyncableFromProfile(profile_);
-  const PrefService::Preference* pref = prefs->FindPreference(path.c_str());
+  const PrefService::Preference* pref = prefs->FindPreference(path);
   DCHECK(pref);
   std::string source_name(
       from_sync ? ".PulledFromSync" : ".PushedToSync");
   std::string histogram_name("Settings." + histogram_name_prefix + source_name);
   callback.Run(histogram_name, pref->GetValue());
 }
 
 void PrefMetricsService::LogBooleanPrefChange(const std::string& histogram_name,
                                               const base::Value* value) {
   bool boolean_value = false;
@@ skipping 51 matching lines @@
 }
 
 bool PrefMetricsService::Factory::ServiceIsNULLWhileTesting() const {
   return false;
 }
 
 content::BrowserContext* PrefMetricsService::Factory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }