GitLab

Call WebContentsObserver::RenderFrameCreated for frames created
via RenderFrameHostManager::CreateRenderFrame.

During WebContentsImpl destruction, make sure that RenderFrameDeleted
is always called, by destroying the frame tree and all proxies before
clearing the observer list.

BUG=364974,374491

Review URL: https://codereview.chromium.org/292363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272586 0039d316-1c4b-4281-b951-d872f2087c98