Remove uses of base::hash_map from //chrome

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 73 matching lines @@
   }
 
   return FetchFont(script, map_name);
 }
 
 // There are ~1000 entries in the cache. Avoid unnecessary object construction,
 // including std::string.
 void FontFamilyCache::OnPrefsChanged(const std::string& pref_name) {
   const size_t delimiter_length = 1;
   const char delimiter = '.';
-  for (FontFamilyMap::iterator it = font_family_map_.begin();
-       it != font_family_map_.end();
-       ++it) {
-    const char* map_name = it->first;
+  for (auto& it : font_family_map_) {
+    const char* map_name = it.first;
     size_t map_name_length = strlen(map_name);
 
     // If the map name doesn't match, move on.
     if (pref_name.compare(0, map_name_length, map_name) != 0)
       continue;
 
-    ScriptFontMap& map = it->second;
+    ScriptFontMap& map = it.second;
     for (ScriptFontMap::iterator it2 = map.begin(); it2 != map.end(); ++it2) {
       const char* script = it2->first;
       size_t script_length = strlen(script);
 
       // If the length doesn't match, move on.
       if (pref_name.size() !=
           map_name_length + script_length + delimiter_length)
         continue;
 
       // If the script doesn't match, move on.
@@ skipping 12 matching lines @@
     }
   }
 }
 
 void FontFamilyCache::Observe(int type,
                               const content::NotificationSource& source,
                               const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PROFILE_DESTROYED, type);
   profile_pref_registrar_.RemoveAll();
 }