| Index: chrome/common/thumbnail_score.cc
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| ===================================================================
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| --- chrome/common/thumbnail_score.cc	(revision 3954)
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| +++ chrome/common/thumbnail_score.cc	(working copy)
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| @@ -6,6 +6,9 @@
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|  
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|  #include "base/logging.h"
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|  
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| +using base::Time;
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| +using base::TimeDelta;
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| +
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|  const TimeDelta ThumbnailScore::kUpdateThumbnailTime = TimeDelta::FromDays(1);
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|  const double ThumbnailScore::kThumbnailMaximumBoringness = 0.94;
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|  const double ThumbnailScore::kThumbnailDegradePerHour = 0.01;
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| 
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