remove reference to (deleted) SkKernel33MaskFilter

BUG=skia:
R=caryclark@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/281163002

git-svn-id: http://skia.googlecode.com/svn/trunk@14738 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/effects.gypi b/gyp/effects.gypi
index 40e8787..e4ee7b1 100644
--- a/gyp/effects.gypi
+++ b/gyp/effects.gypi
@@ -101,7 +101,6 @@
     '<(skia_include_path)/effects/SkDropShadowImageFilter.h',
     '<(skia_include_path)/effects/SkEmbossMaskFilter.h',
     '<(skia_include_path)/effects/SkGradientShader.h',
-    '<(skia_include_path)/effects/SkKernel33MaskFilter.h',
     '<(skia_include_path)/effects/SkLayerDrawLooper.h',
     '<(skia_include_path)/effects/SkLayerRasterizer.h',
     '<(skia_include_path)/effects/SkLerpXfermode.h',