[bfcache] Filter out new content_unittests failures

- All/RenderFrameHostManagerTest.BeginNavigationIgnoredWhenNotActive/*
- WebContentsImplTest.ActiveContentsCountChangeBrowsingInstance

This CL also moves
RenderFrameHostImplBrowserTest.CheckIsCurrentBeforeAndAfterUnload to
content_browsertests.filter

BUG=1102630

Change-Id: I0a2a0d5a0ad8303ff7ff73c41688b76c8a514f3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284019Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785732}

testing/buildbot/filters/bfcache.content_browsertests.filter

@@ -44,3 +44,7 @@
 -All/SitePerProcessBrowserTest.NavigateMainFrameToChildSite/*
 -All/SitePerProcessBrowserTest.RenderViewHostIsNotReusedAfterDelayedUnloadACK/*
 -All/SitePerProcessBrowserTest.TwoCrossSitePendingNavigationsAndSubframeWins/*
+
+# https://crbug.com/1062923
+# Need investigation.
+-RenderFrameHostImplBrowserTest.CheckIsCurrentBeforeAndAfterUnload

testing/buildbot/filters/bfcache.content_unittests.filter

 # These tests currently fail when run with --enable-features=BackForwardCache
 
-# https://crbug.com/1062923
-# Need investigation.
--RenderFrameHostImplBrowserTest.CheckIsCurrentBeforeAndAfterUnload
+# https://crbug.com/1102630
+# Needs investigation.
+-All/RenderFrameHostManagerTest.BeginNavigationIgnoredWhenNotActive/*
+-WebContentsImplTest.ActiveContentsCountChangeBrowsingInstance