Remove redundant c_str() calls.

chrome/browser/first_run/first_run.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/first_run/first_run.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 668 matching lines @@
     internal::CreateSentinel();
 }
 
 std::string GetPingDelayPrefName() {
   return base::StringPrintf("%s.%s",
                             installer::master_preferences::kDistroDict,
                             installer::master_preferences::kDistroPingDelay);
 }
 
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterIntegerPref(GetPingDelayPrefName().c_str(), 0);
+  registry->RegisterIntegerPref(GetPingDelayPrefName(), 0);
 }
 
 bool SetShowFirstRunBubblePref(FirstRunBubbleOptions show_bubble_option) {
   PrefService* local_state = g_browser_process->local_state();
   if (!local_state)
     return false;
   if (local_state->GetInteger(
           prefs::kShowFirstRunBubbleOption) != FIRST_RUN_BUBBLE_SUPPRESS) {
     // Set the new state as long as the bubble wasn't explicitly suppressed
     // already.
@@ skipping 157 matching lines @@
   SetShouldDoPersonalDataManagerFirstRun();
 
   internal::DoPostImportPlatformSpecificTasks(profile);
 }
 
 uint16_t auto_import_state() {
   return g_auto_import_state;
 }
 
 }  // namespace first_run