Remove stl_util's deletion function use from content/.

content/browser/appcache/appcache_service_impl.h

Index: content/browser/appcache/appcache_service_impl.h
diff --git a/content/browser/appcache/appcache_service_impl.h b/content/browser/appcache/appcache_service_impl.h
index 1fdc34836cb7aae34acb4dd32d7e4f8ee05fdc91..ea78f6910e9c79c071320a9e4c82c635e33ae039 100644
--- a/content/browser/appcache/appcache_service_impl.h
+++ b/content/browser/appcache/appcache_service_impl.h
@@ -9,7 +9,6 @@
 
 #include <map>
 #include <memory>
-#include <set>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
@@ -195,8 +194,9 @@ class CONTENT_EXPORT AppCacheServiceImpl
   class GetInfoHelper;
   class CheckResponseHelper;
 
-  typedef std::set<AsyncHelper*> PendingAsyncHelpers;
-  typedef std::map<int, AppCacheBackendImpl*> BackendMap;
+  using PendingAsyncHelpers =
+      std::map<AsyncHelper*, std::unique_ptr<AsyncHelper>>;
+  using BackendMap = std::map<int, AppCacheBackendImpl*>;
 
   void Reinitialize();