add missing headers in ppapi/*

ppapi/proxy/truetype_font_singleton_resource.cc

 // Copyright (c) 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 "ppapi/proxy/truetype_font_singleton_resource.h"
 
+#include "base/bind.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/serialized_structs.h"
 #include "ppapi/shared_impl/array_writer.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/shared_impl/var_tracker.h"
 
 namespace ppapi {
 namespace proxy {
@@ skipping 95 matching lines @@
     }
   } else {
     result = PP_ERROR_FAILED;
   }
 
   callback->Run(result);
 }
 
 }  // namespace proxy
 }  // namespace ppapi