remove (now unused) Sk64 -- just use int64_t

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.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',
@@ skipping 184 matching lines @@
         '<(skia_src_path)/image/SkImage_Picture.cpp',
         '<(skia_src_path)/image/SkImage_Raster.cpp',
         '<(skia_src_path)/image/SkSurface.cpp',
 #        '<(skia_src_path)/image/SkSurface_Gpu.cpp',
         '<(skia_src_path)/image/SkSurface_Picture.cpp',
         '<(skia_src_path)/image/SkSurface_Raster.cpp',
 
         '<(skia_src_path)/pipe/SkGPipeRead.cpp',
         '<(skia_src_path)/pipe/SkGPipeWrite.cpp',
 
-        '<(skia_include_path)/core/Sk64.h',
         '<(skia_include_path)/core/SkAdvancedTypefaceMetrics.h',
         '<(skia_include_path)/core/SkBitmap.h',
         '<(skia_include_path)/core/SkBitmapDevice.h',
         '<(skia_include_path)/core/SkBlitRow.h',
         '<(skia_include_path)/core/SkBounder.h',
         '<(skia_include_path)/core/SkCanvas.h',
         '<(skia_include_path)/core/SkChecksum.h',
         '<(skia_include_path)/core/SkChunkAlloc.h',
         '<(skia_include_path)/core/SkClipStack.h',
         '<(skia_include_path)/core/SkColor.h',
@@ skipping 130 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',
     ],
 }