FBTF: Remove unneeded headers from base/ (part 2)

media/base/mock_filter_host.h

 // Copyright (c) 2010 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.
 //
 // A FilterHost implementation based on gmock.  Combined with setting a message
 // loop on a filter, permits single-threaded testing of filters without
 // requiring a pipeline.
 
 #ifndef MEDIA_BASE_MOCK_FILTER_HOST_H_
 #define MEDIA_BASE_MOCK_FILTER_HOST_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
-#include "base/waitable_event.h"
 #include "media/base/factory.h"
 #include "media/base/filter_host.h"
 #include "media/base/filters.h"
 #include "media/base/media_format.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class MockFilterHost : public FilterHost {
@@ skipping 19 matching lines @@
   MOCK_METHOD1(SetCurrentReadPosition, void(int64 offset));
   MOCK_METHOD0(GetCurrentReadPosition, int64());
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockFilterHost);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_FILTER_HOST_H_