Update .DEPS.git

Cr-Commit-Position: refs/heads/master@{#290189}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@290189 0039d316-1c4b-4281-b951-d872f2087c98

.DEPS.git

@@ -9,7 +9,7 @@ vars = {
     'git_url':
          'https://chromium.googlesource.com',
     'webkit_rev':
-         '@8719e7ba9293e52a91bb4ffe9533762c5c8b1e9c',
+         '@42f2b36366bed2b5f24f44531a8707c0a5f05fb2',
     'angle_revision':
          'bc75f36b04c8bab99bcecf8cdca16ecee3ac58ee'
 }