Fix compilation with SK_ENABLE_INST_COUNT=1

gyp/core.gypi

 # 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
 #
 {
     'sources': [
         '<(skia_src_path)/core/ARGB32_Clamp_Bilinear_BitmapShader.h',
         '<(skia_src_path)/core/Sk64.cpp',
         '<(skia_src_path)/core/SkAAClip.cpp',
         '<(skia_src_path)/core/SkAnnotation.cpp',
         '<(skia_src_path)/core/SkAdvancedTypefaceMetrics.cpp',
         '<(skia_src_path)/core/SkAlphaRuns.cpp',
         '<(skia_src_path)/core/SkAntiRun.h',
-        '<(skia_src_path)/core/SkBBoxHierarchy.cpp',
         '<(skia_src_path)/core/SkBBoxHierarchy.h',
         '<(skia_src_path)/core/SkBBoxRecord.cpp',
         '<(skia_src_path)/core/SkBBoxRecord.h',
         '<(skia_src_path)/core/SkBBoxHierarchyRecord.cpp',
         '<(skia_src_path)/core/SkBBoxHierarchyRecord.h',
         '<(skia_src_path)/core/SkBitmap.cpp',
         '<(skia_src_path)/core/SkBitmapDevice.cpp',
         '<(skia_src_path)/core/SkBitmapFilter.h',
         '<(skia_src_path)/core/SkBitmapFilter.cpp',
         '<(skia_src_path)/core/SkBitmapHeap.cpp',
@@ skipping 114 matching lines @@
         '<(skia_src_path)/core/SkPictureStateTree.h',
         '<(skia_src_path)/core/SkPixelRef.cpp',
         '<(skia_src_path)/core/SkPoint.cpp',
         '<(skia_src_path)/core/SkProcSpriteBlitter.cpp',
         '<(skia_src_path)/core/SkPtrRecorder.cpp',
         '<(skia_src_path)/core/SkQuadClipper.cpp',
         '<(skia_src_path)/core/SkQuadClipper.h',
         '<(skia_src_path)/core/SkRasterClip.cpp',
         '<(skia_src_path)/core/SkRasterizer.cpp',
         '<(skia_src_path)/core/SkRect.cpp',
-        '<(skia_src_path)/core/SkRefCnt.cpp',
         '<(skia_src_path)/core/SkRefDict.cpp',
         '<(skia_src_path)/core/SkRegion.cpp',
         '<(skia_src_path)/core/SkRegionPriv.h',
         '<(skia_src_path)/core/SkRegion_path.cpp',
         '<(skia_src_path)/core/SkRRect.cpp',
         '<(skia_src_path)/core/SkRTree.h',
         '<(skia_src_path)/core/SkRTree.cpp',
         '<(skia_src_path)/core/SkScaledImageCache.cpp',
         '<(skia_src_path)/core/SkScalar.cpp',
         '<(skia_src_path)/core/SkScalerContext.cpp',
@@ skipping 214 matching lines @@
         '<(skia_src_path)/pathops/SkPathOpsPoint.h',
         '<(skia_src_path)/pathops/SkPathOpsQuad.h',
         '<(skia_src_path)/pathops/SkPathOpsRect.h',
         '<(skia_src_path)/pathops/SkPathOpsTriangle.h',
         '<(skia_src_path)/pathops/SkPathOpsTypes.h',
         '<(skia_src_path)/pathops/SkPathWriter.h',
         '<(skia_src_path)/pathops/SkQuarticRoot.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }