Remove use of <iostream> where unnecessary.

media/tools/scaler_bench/scaler_bench.cc

 // 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.
 
 // This tool can be used to measure performace of video frame scaling
 // code. It times performance of the scaler with and without filtering.
 // It also measures performance of the Skia scaler for comparison.
 
-#include <iostream>
+#include <ostream>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "media/base/video_frame.h"
 #include "media/base/yuv_convert.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 207 matching lines @@
             << BenchmarkFilter(media::FILTER_BILINEAR_V)
             << "ms/frame" << std::endl;
   std::cout << "Bilinear Horizontal: "
             << BenchmarkFilter(media::FILTER_BILINEAR_H)
             << "ms/frame" << std::endl;
   std::cout << "Bilinear: " << BenchmarkFilter(media::FILTER_BILINEAR)
             << "ms/frame" << std::endl;
 
   return 0;
 }