Cleanup the XML directory in public includes.

gyp/experimental.gyp

 # GYP file to build experimental directory.
 {
   'targets': [
     {
       'target_name': 'experimental',
       'type': 'static_library',
       'include_dirs': [
         '../include/config',
         '../include/core',
       ],
@@ skipping 14 matching lines @@
       'mac_bundle' : 1,
       'sources': [
         '../experimental/SkiaExamples/SkExample.h',
         '../experimental/SkiaExamples/SkExample.cpp',
         '../experimental/SkiaExamples/HelloSkiaExample.cpp',
       ],
       'dependencies': [
         'flags.gyp:flags',
         'skia_lib.gyp:skia_lib',
         'views.gyp:views',
-        'xml.gyp:xml',
       ],
       'conditions' : [
         [ 'skia_gpu == 1', {
           'include_dirs' : [
             '../src/gpu',
           ],
         }],
         [ 'skia_os == "win"', {
           'sources' : [
             '../src/views/win/SkOSWindow_Win.cpp',
@@ skipping 24 matching lines @@
             'INFOPLIST_FILE' : '../experimental/SkiaExamples/SkiaExamples-Info.plist',
           },
           'mac_bundle_resources' : [
             '../experimental/SkiaExamples/SkiaExamples.xib'
           ],
         }],
       ],
     }
   ],
 }