add missing headers in ppapi/*

ppapi/proxy/host_resolver_resource_base.cc

 // Copyright 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/host_resolver_resource_base.h"
 
+#include "base/bind.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/net_address_resource.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/shared_impl/var.h"
 
 namespace ppapi {
 namespace proxy {
 
 namespace {
@@ skipping 105 matching lines @@
       base::Bind(&HostResolverResourceBase::OnPluginMsgResolveReply,
                  base::Unretained(this)));
 }
 
 bool HostResolverResourceBase::ResolveInProgress() const {
   return TrackedCallback::IsPending(resolve_callback_);
 }
 
 }  // namespace proxy
 }  // namespace ppapi