remove unused SkCullPoints

gyp/SampleApp.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 {
   'targets': [
     {
       'target_name': 'SampleApp',
       'type': 'executable',
@@ skipping 40 matching lines @@
         '../samplecode/SampleCamera.cpp',
         '../samplecode/SampleChart.cpp',
         '../samplecode/SampleCircle.cpp',
         '../samplecode/SampleClip.cpp',
         '../samplecode/SampleClipDrawMatch.cpp',
         '../samplecode/SampleClock.cpp',
         '../samplecode/SampleCode.h',
         '../samplecode/SampleColorFilter.cpp',
         '../samplecode/SampleComplexClip.cpp',
         '../samplecode/SampleConcavePaths.cpp',
-        '../samplecode/SampleCull.cpp',
         '../samplecode/SampleDegenerateTwoPtRadials.cpp',
         '../samplecode/SampleDither.cpp',
         '../samplecode/SampleDitherBitmap.cpp',
         '../samplecode/SampleEffects.cpp',
         '../samplecode/SampleEmboss.cpp',
         '../samplecode/SampleFatBits.cpp',
         '../samplecode/SampleFillType.cpp',
         '../samplecode/SampleFilter.cpp',
         '../samplecode/SampleFilter2.cpp',
         '../samplecode/SampleFilterQuality.cpp',
@@ skipping 198 matching lines @@
           ],
         }],
         [ 'not skia_pdf', {
           'dependencies!': [ 'pdf.gyp:pdf' ],
           'dependencies': [ 'pdf.gyp:nopdf' ],
         }],
       ],
     },
   ],
 }