remove webkit/data from isolate file since the test data has been moved out

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284745 0039d316-1c4b-4281-b951-d872f2087c98

content/content_unittests.isolate

@@ -7,7 +7,6 @@
       'variables': {
         'isolate_dependency_untracked': [
           '../media/test/data/',
-          '../webkit/data/',
           'test/data/',
         ],
       },