Move thumbnail to history component

components/history/core/common/thumbnail_score.h

 // Copyright (c) 2012 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.
 
-#ifndef CHROME_COMMON_THUMBNAIL_SCORE_H_
-#define CHROME_COMMON_THUMBNAIL_SCORE_H_
+#ifndef COMPONENTS_HISTORY_CORE_COMMON_THUMBNAIL_SCORE_H_
+#define COMPONENTS_HISTORY_CORE_COMMON_THUMBNAIL_SCORE_H_
 
 #include <string>
 #include "base/time/time.h"
 
 // A set of metadata about a Thumbnail.
 struct ThumbnailScore {
   // Initializes the ThumbnailScore to the absolute worst possible values
   // except for time, which is set to Now(), and redirect_hops_from_dest which
   // is set to 0.
   ThumbnailScore();
@@ skipping 85 matching lines @@
   // Checks whether we should consider updating a new thumbnail based on
   // this score. For instance, we don't have to update a new thumbnail
   // if the current thumbnail is new and interesting enough.
   bool ShouldConsiderUpdating();
 };
 
 // Checks whether we should replace one thumbnail with another.
 bool ShouldReplaceThumbnailWith(const ThumbnailScore& current,
                                 const ThumbnailScore& replacement);
 
-#endif  // CHROME_COMMON_THUMBNAIL_SCORE_H_
+#endif  // COMPONENTS_HISTORY_CORE_COMMON_THUMBNAIL_SCORE_H_