Remove task.h and finish base::Bind() migration.

ppapi/shared_impl/callback_tracker.h

 // Copyright (c) 2011 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.
 
 #ifndef PPAPI_SHARED_IMPL_CALLBACK_TRACKER_H_
 #define PPAPI_SHARED_IMPL_CALLBACK_TRACKER_H_
 
 #include <map>
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
-#include "base/task.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
 class TrackedCallback;
 
 // Pepper callbacks have the following semantics (unless otherwise specified;
 // in particular, the below apply to all completion callbacks):
 //  - Callbacks are always run on the main thread.
@@ skipping 68 matching lines @@
   typedef std::set<scoped_refptr<TrackedCallback> > CallbackSet;
   typedef std::map<PP_Resource, CallbackSet> CallbackSetMap;
   CallbackSetMap pending_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(CallbackTracker);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_CALLBACK_TRACKER_H_