Remove SkBitmapHeap and SkBitmapHeapReader. They're unused.

gyp/core.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Include this gypi to include all 'core' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
@@ skipping 15 matching lines @@
         '<(skia_src_path)/core/SkAutoPixmapStorage.h',
         '<(skia_src_path)/core/SkAutoPixmapStorage.cpp',
         '<(skia_src_path)/core/SkBBHFactory.cpp',
         '<(skia_src_path)/core/SkBBoxHierarchy.h',
         '<(skia_src_path)/core/SkBigPicture.cpp',
         '<(skia_src_path)/core/SkBitmap.cpp',
         '<(skia_src_path)/core/SkBitmapCache.cpp',
         '<(skia_src_path)/core/SkBitmapController.cpp',
         '<(skia_src_path)/core/SkBitmapDevice.cpp',
         '<(skia_src_path)/core/SkBitmapFilter.h',
-        '<(skia_src_path)/core/SkBitmapHeap.cpp',
-        '<(skia_src_path)/core/SkBitmapHeap.h',
         '<(skia_src_path)/core/SkBitmapProcShader.cpp',
         '<(skia_src_path)/core/SkBitmapProcShader.h',
         '<(skia_src_path)/core/SkBitmapProcState.cpp',
         '<(skia_src_path)/core/SkBitmapProcState.h',
         '<(skia_src_path)/core/SkBitmapProcState_filter.h',
         '<(skia_src_path)/core/SkBitmapProcState_matrix.h',
         '<(skia_src_path)/core/SkBitmapProcState_matrix_template.h',
         '<(skia_src_path)/core/SkBitmapProcState_matrixProcs.cpp',
         '<(skia_src_path)/core/SkBitmapProcState_procs.h',
         '<(skia_src_path)/core/SkBitmapProcState_sample.h',
@@ skipping 444 matching lines @@
         '<(skia_src_path)/pathops/SkPathOpsLine.h',
         '<(skia_src_path)/pathops/SkPathOpsPoint.h',
         '<(skia_src_path)/pathops/SkPathOpsQuad.h',
         '<(skia_src_path)/pathops/SkPathOpsRect.h',
         '<(skia_src_path)/pathops/SkPathOpsTSect.h',
         '<(skia_src_path)/pathops/SkPathOpsTypes.h',
         '<(skia_src_path)/pathops/SkPathWriter.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }