GitLab

The WebLayer* given to SetWebLayer() must be kept alive until /after/
the next call to SetWebLayer(), as the client will hold and use that
pointer, including inside the next SetWebLayer() call.

R=xhwang@chromium.org

Bug: 843114
Change-Id: Iee4bc139f02f918f60e7b13455ed2b47bedaa1b9
Reviewed-on: https://chromium-review.googlesource.com/1059698
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558848}