Update to latest WebKit changes:

- Fix DevConsole crash with JS see Issue https://github.com/dart-lang/sdk/issues/29873
     CL https://codereview.chromium.org/2941143002
- Fix debugging in WebStorm, NULL returned for JS objects see Issue https://github.com/dart-lang/sdk/issues/29854
     CL https://codereview.chromium.org/2945063002

TBR=jacobr@google.com

Review-Url: https://codereview.chromium.org/2952643002 .
diff --git a/tools/deps/dartium.deps/DEPS b/tools/deps/dartium.deps/DEPS
index e4f5d8e..6905aa8 100644
--- a/tools/deps/dartium.deps/DEPS
+++ b/tools/deps/dartium.deps/DEPS
@@ -7,7 +7,7 @@
 vars = {
   # Start of Dartium vars
 
-  "dartium_chromium_commit": "df716be7058f7fb88209c97cb8bbc55f2e6fbd75",
+  "dartium_chromium_commit": "aa424e93dc062d902d80db3e5e28c8b309f39403",
   "chromium_base_revision": "378081",
 
   # We use mirrors of all github repos to guarantee reproducibility and