GitLab

tabs api and webview have APIs for capturing tab contents, turn
them to UIThreadExtensionFunction from AsyncExtensionFunction.

AsyncExtensionFunction is deprecated and will be removed soon.

Bug: 829174
Change-Id: I9cc390cc00903eab62b2e0b5ac42394333f243ec
Reviewed-on: https://chromium-review.googlesource.com/997106
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548633}