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1) The test has been fixed by:
   https://chromium-review.googlesource.com/c/chromium/src/+/1816509
   The fix was to flush the BackForwardCache to avoid the
   FrameHostInterceptor to miss "simulating RenderFrameHostCreated" on
   the RenderFrameHost in the BackForwardCache.

2) Flushing the cache became asynchronous, which caused the test to fail
   again.
   https://chromium-review.googlesource.com/c/chromium/src/+/1807321

In this CL, instead of flushing the BackForwardCache, we create the
FrameHostInterceptor before the navigations. That way, it can correctly
index every created RenderFrameHost. It won't have to simulate receiving
RenderFrameHostCreated anymore.

Bug: 1017605
Change-Id: I882d459e53a84331f4ec8dfaa4df1b07cc160c2f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878187Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709408}