Remove sfnt dependency from xps gyp tartget.

The xps gyp target depends on skia_lib, which in turn contains
the sfnt target (and re-exports it settings). As a result, it
should not separately depend on the sfnt target. This currently
isn't causing issues because the sfnt target is mostly header only,
but any code in it may be duplicated.

Review URL: https://codereview.chromium.org/1038693003

gyp/xps.gyp

@@ -14,7 +14,6 @@
           'defines': [ 'SK_XPS_USE_DETERMINISTIC_IDS', ],
           'dependencies': [
             'skia_lib.gyp:skia_lib',
-            'sfnt.gyp:sfnt',
           ],
           'include_dirs': [
             '../include/device/xps',