FBTB: Remove unneeded #includes of base/ref_counted.h and base/string16.h in src/chrome.

chrome/renderer/renderer_histogram_snapshots.h

Index: chrome/renderer/renderer_histogram_snapshots.h
diff --git a/chrome/renderer/renderer_histogram_snapshots.h b/chrome/renderer/renderer_histogram_snapshots.h
index 98c86803e3ee94434d46d9e0b59409cd0b53d04c..d7e3f848bfef7e0133d3a02a3716747779b29a39 100644
--- a/chrome/renderer/renderer_histogram_snapshots.h
+++ b/chrome/renderer/renderer_histogram_snapshots.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -13,7 +13,6 @@
 #include "base/basictypes.h"
 #include "base/histogram.h"
 #include "base/process.h"
-#include "base/scoped_ptr.h"
 #include "base/task.h"
 
 class RendererHistogramSnapshots {