GitLab

Message handlers should call AllowJavascript() and shouldn't used
deprecated base::Value methods.

Bug: None
Change-Id: I88ededca440d800bff6ded8bc3f1078c7c83f78f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637647
Auto-Submit: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665280}