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Use back_forward_cache/no-favicon.html as the test page, as favicons are
known to cause issues for BFCache tests, as seen with
ChromeBackForwardCacheBrowserTest. Fix a few nits along the way.

This is a precursor to https://crrev.com/c/2353886, which will trigger
flaky behavior without this CL.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android-bfcache-rel
CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux-bfcache-rel

Bug: 956832
Change-Id: I62dbb2c05542a7ed027f400c7000b87f5d64b6da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361535Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799501}