increase coverage of SkPath.cpp, remove unused code

gyp/gmslides.gypi

 # include this gypi to include all the golden master slides.
 {
   'sources': [
     '../gm/aaclip.cpp',
     '../gm/aarectmodes.cpp',
     '../gm/alphagradients.cpp',
     '../gm/androidfallback.cpp',
     '../gm/arcofzorro.cpp',
     '../gm/arithmode.cpp',
     '../gm/beziereffects.cpp',
@@ skipping 52 matching lines @@
     '../gm/gammatext.cpp',
     '../gm/getpostextpath.cpp',
     '../gm/giantbitmap.cpp',
     '../gm/gradients.cpp',
     '../gm/gradients_no_texture.cpp',
     '../gm/gradientDirtyLaundry.cpp',
     '../gm/gradient_matrix.cpp',
     '../gm/gradtext.cpp',
     '../gm/hairlines.cpp',
     '../gm/hairmodes.cpp',
-    '../gm/hittestpath.cpp',
     '../gm/imageblur.cpp',
     '../gm/imagemagnifier.cpp',
     '../gm/inversepaths.cpp',
     '../gm/lerpmode.cpp',
     '../gm/lighting.cpp',
     '../gm/lumafilter.cpp',
     '../gm/image.cpp',
     '../gm/imagefiltersbase.cpp',
     '../gm/imagefilterscropped.cpp',
     '../gm/imagefiltersgraph.cpp',
@@ skipping 63 matching lines @@
     '../gm/xfermodes2.cpp',
     '../gm/xfermodes3.cpp',
   ],
 }
 
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