Remove unused Skia includes in SkPMetric.h

chrome/browser/chromeos/login/screenshot_testing/SkPMetric.h

 // Copyright 2014 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.
 
 // WARNING! This file is copied from third_party/skia/tools/skpdiff and slightly
 // modified to be compilable outside Skia and suit chromium style. Some comments
 // can make no sense.
 // TODO(elizavetai): remove this file and reuse the original one in Skia
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SKPMETRIC_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SKPMETRIC_H_
 
 #include "chrome/browser/chromeos/login/screenshot_testing/SkImageDiffer.h"
-#include "third_party/skia/include/core/SkTArray.h"
-#include "third_party/skia/include/core/SkTDArray.h"
 
 /**
  * An image differ that uses the pdiff image metric to compare images.
  */
 
 class SkPMetric {
  public:
   virtual bool diff(SkBitmap* baseline,
                     SkBitmap* test,
                     const SkImageDiffer::BitmapsToCreate& bitmapsToCreate,
                     SkImageDiffer::Result* result);
 
  private:
   typedef SkImageDiffer INHERITED;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SKPMETRIC_H_