Remove NEON runtime detection support.

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
@@ skipping 271 matching lines @@
             ],
             'conditions': [
               [ 'arm_neon == 1', {
                 'defines': [
                   'SK_ARM_HAS_NEON',
                 ],
                 'cflags': [
                   '-mfpu=neon',
                 ],
               }],
-              [ 'arm_neon_optional == 1', {
-                'defines': [
-                  'SK_ARM_HAS_OPTIONAL_NEON',
-                ],
-              }],
               [ 'skia_os != "linux"', {
                 'cflags': [
                   '-mfloat-abi=softfp',
                 ],
               }],
             ],
           }],
           [ '"mips" in skia_arch_type', {
             'cflags': [ '-EL' ],
             'conditions': [
@@ skipping 378 matching lines @@
           'LD_RUNPATH_SEARCH_PATHS': ['@executable_path/.'],
       },
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }