Remove redundant c_str() calls.

chrome/browser/font_family_cache.cc

 // Copyright 2014 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/font_family_cache.h"
 
 #include <stddef.h>
 
 #include <map>
 
@@ skipping 51 matching lines @@
   std::string pref_name = base::StringPrintf("%s.%s", map_name, script);
   std::string font = prefs_->GetString(pref_name.c_str());
   base::string16 font16 = base::UTF8ToUTF16(font);
 
   // Lazily constructs the map if it doesn't already exist.
   ScriptFontMap& map = font_family_map_[map_name];
   map[script] = font16;
 
   // Register for profile preference changes.
   profile_pref_registrar_.Add(
-      pref_name.c_str(),
+      pref_name,
       base::Bind(&FontFamilyCache::OnPrefsChanged, base::Unretained(this)));
   return font16;
 }
 
 base::string16 FontFamilyCache::FetchAndCacheFont(const char* script,
                                                   const char* map_name) {
   FontFamilyMap::const_iterator it = font_family_map_.find(map_name);
   if (it != font_family_map_.end()) {
     ScriptFontMap::const_iterator it2 = it->second.find(script);
     if (it2 != it->second.end())
@@ skipping 32 matching lines @@
       if (pref_name.compare(
               map_name_length + delimiter_length, script_length, script) != 0)
         continue;
 
       // If the delimiter doesn't match, move on.
       if (pref_name[map_name_length] != delimiter)
         continue;
 
       // Clear the cache and the observer.
       map.erase(it2);
-      profile_pref_registrar_.Remove(pref_name.c_str());
+      profile_pref_registrar_.Remove(pref_name);
       break;
     }
   }
 }
 
 void FontFamilyCache::Observe(int type,
                               const content::NotificationSource& source,
                               const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PROFILE_DESTROYED, type);
   profile_pref_registrar_.RemoveAll();
 }