Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284797 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/.DEPS.git b/.DEPS.git
index c93b018..f458f27 100644
--- a/.DEPS.git
+++ b/.DEPS.git
@@ -9,7 +9,7 @@
     'git_url':
          'https://chromium.googlesource.com',
     'webkit_rev':
-         '@ff92770c615add7a3323491d34bce78dd7c6c74e',
+         '@477189d09ffb643aaff73e6360631670a6e5258c',
     'angle_revision':
          '11c26b9c1182c9872693bab0b1fbf0fac148ab73'
 }