GitLab

Main frame RenderWidgets are now owned by RenderFrameImpl just like
child frames' are.

R=dcheng@chromium.org, haraken@chromium.org

Bug: 419087
Change-Id: I4f02f1b4c71299cc2f37f9249b3cc84b3662ed11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2038720Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738590}