Delete dead code. SkBitmapHasher has not been used since gm.

gm/gm_expectations.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * TODO(epoger): Combine this with tools/image_expectations.h, or eliminate one of the two.
  */
 #ifndef gm_expectations_DEFINED
 #define gm_expectations_DEFINED
 
 #include "gm.h"
 #include "SkBitmap.h"
-#include "SkBitmapHasher.h"
 #include "SkData.h"
 #include "SkJSONCPP.h"
 #include "SkOSFile.h"
 #include "SkRefCnt.h"
 #include "SkStream.h"
 #include "SkTArray.h"
 
 
 namespace skiagm {
 
@@ skipping 195 matching lines @@
          * Returns true if successful.
          */
         static bool Parse(const char *jsonPath, Json::Value *jsonRoot);
 
         Json::Value fJsonRoot;
         Json::Value fJsonExpectedResults;
     };
 
 }
 #endif