remove unneeded flags

BUG=skia:

Review URL: https://codereview.chromium.org/1010063002

gyp/skia_for_android_framework_defines.gypi

@@ -13,12 +13,10 @@
     # If these become 'permanent', they should be moved into common_variables.gypi
     #
     'skia_for_android_framework_defines': [
-      'SK_SUPPORT_LEGACY_GRADIENT_FACTORIES',
       'SK_SUPPORT_LEGACY_PUBLIC_IMAGEINFO_FIELDS',
       'SK_SUPPORT_LEGACY_GETDEVICE',
       # Needed until we fix skbug.com/2440.
       'SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG',
-      'SK_LEGACY_DRAWPICTURECALLBACK',
     ],
   },
 }