Remove <iostream> where possible.

gfx/size.cc

 // Copyright (c) 2006-2008 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 "gfx/size.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_MACOSX)
 #include <CoreGraphics/CGGeometry.h>
 #endif
 
-#include <iostream>
+#include <ostream>
 
 #include "base/logging.h"
 
 namespace gfx {
 
 Size::Size(int width, int height) {
   set_width(width);
   set_height(height);
 }
 
@@ skipping 37 matching lines @@
     height = 0;
   }
   height_ = height;
 }
 
 }  // namespace gfx
 
 std::ostream& operator<<(std::ostream& out, const gfx::Size& s) {
   return out << s.width() << "x" << s.height();
 }