Updated to WebKit - a few API changes.

TBR=turnbridge@google.com

Review URL: https://codereview.chromium.org/2195343002 .
diff --git a/tools/deps/dartium.deps/DEPS b/tools/deps/dartium.deps/DEPS
index 19f4e04..b73f612 100644
--- a/tools/deps/dartium.deps/DEPS
+++ b/tools/deps/dartium.deps/DEPS
@@ -9,7 +9,7 @@
 
 vars.update({
   "dartium_chromium_commit": "67a7ba9669f7bb0300ef35085d4e6bb98b1966cc",
-  "dartium_webkit_commit": "241a4a90dd2aa42490243c2efcc8732ff8aa0a59",
+  "dartium_webkit_commit": "bfb8649f69c7b02100aa6fd5a9c77d7858106d1b",
   "chromium_base_revision": "338390",
 
   # We use mirrors of all github repos to guarantee reproducibility and