refactor gyp to isolate freetype usage

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
 #    'SK_SUPPORT_HINTING_SCALE_FACTOR',
   ],
   'conditions' : [
     [ 'skia_gpu == 1',
       {
@@ skipping 222 matching lines @@
               'SK_BUILD_FOR_NACL',
             ],
             'link_settings': {
               'libraries': [
                 '-lppapi',
                 '-lppapi_cpp',
                 '-lnosys',
                 '-pthread',
               ],
             },
-          }, { # skia_os != "nacl"
-            'include_dirs' : [
-              '/usr/include/freetype2',
-            ],
           }],
           [ 'skia_os == "chromeos"', {
             'ldflags': [
               '-lstdc++',
               '-lm',
             ],
           }, {
             'conditions': [
               [ 'skia_arch_width == 64 and skia_arch_type == "x86"', {
                 'cflags': [
@@ skipping 207 matching lines @@
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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