Update .DEPS.git

Cr-Commit-Position: refs/heads/master@{#290149}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290149 0039d316-1c4b-4281-b951-d872f2087c98

.DEPS.git

@@ -9,7 +9,7 @@ vars = {
     'git_url':
          'https://chromium.googlesource.com',
     'webkit_rev':
-         '@353b84d09a5dd40bd88ceb11599b2f8b8dfde205',
+         '@c199ded16d1482b7d430d7ba2ccdf89706caf4f6',
     'angle_revision':
          'bc75f36b04c8bab99bcecf8cdca16ecee3ac58ee'
 }