remove kA1_Config, as it is no longer supported

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',
@@ skipping 26 matching lines @@
         '<(skia_src_path)/core/SkBitmapScaler.cpp',
         '<(skia_src_path)/core/SkBitmapShader16BilerpTemplate.h',
         '<(skia_src_path)/core/SkBitmapShaderTemplate.h',
         '<(skia_src_path)/core/SkBitmap_scroll.cpp',
         '<(skia_src_path)/core/SkBlitBWMaskTemplate.h',
         '<(skia_src_path)/core/SkBlitMask_D32.cpp',
         '<(skia_src_path)/core/SkBlitRow_D16.cpp',
         '<(skia_src_path)/core/SkBlitRow_D32.cpp',
         '<(skia_src_path)/core/SkBlitter.h',
         '<(skia_src_path)/core/SkBlitter.cpp',
-        '<(skia_src_path)/core/SkBlitter_A1.cpp',
         '<(skia_src_path)/core/SkBlitter_A8.cpp',
         '<(skia_src_path)/core/SkBlitter_ARGB32.cpp',
         '<(skia_src_path)/core/SkBlitter_RGB16.cpp',
         '<(skia_src_path)/core/SkBlitter_Sprite.cpp',
         '<(skia_src_path)/core/SkBuffer.cpp',
         '<(skia_src_path)/core/SkCanvas.cpp',
         '<(skia_src_path)/core/SkChunkAlloc.cpp',
         '<(skia_src_path)/core/SkClipStack.cpp',
         '<(skia_src_path)/core/SkColor.cpp',
         '<(skia_src_path)/core/SkColorFilter.cpp',
@@ skipping 326 matching lines @@
         '<(skia_src_path)/pathops/SkQuarticRoot.h',
         '<(skia_src_path)/pathops/SkReduceOrder.h',
     ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: