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Same-document navigations (such as history.pushState() calls) cause
associated DidStartNavigation() and DidFinishNavigation()
calls. However, since this isn't considered a load,
DocumentOnLoadCompletedInMainFrame() is sensibly not called.

ThumbnailReadinessTracker assumed DidStartNavigation eventually lead
to a DocumentOnLoadCompletedInMainFrame call (or an error). This meant
that pages using history.pushState(), such as YouTube, had
never-ending thumbnail capture.

This CL fixes the never-ending capture.

Bug: 1120940
Change-Id: Ia298d384b44bcc2b860260826952898972daf480
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382426Reviewed-by: Dana Fried <dfried@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803294}