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Currently, WebContentsObserver::RenderFrameHostChanged callback is
being dispatched before WebContentsObserver::RenderFrameCreated callback
for child frames.

This is problematic as embedders use
WebContentsObserver::RenderFrameCreated callback to initialize
per-RenderFrameHost state. This CL fixes this ordering.

BUG=1097143

Change-Id: Iced632ee3369b3dbf3822dd57620b687ed47cb5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2614467
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846079}