Claim the RenderFrameHostManagerTest.DeleteFrameAfterSwapOutACK failure.

Attach https://crbug.com/1019077 to the entry in the filters.

R=rakina@chromium.org

Change-Id: I8aa50cbb9e4fb76eeaf7989a98c6521ff4d12570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885861Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710657}

testing/buildbot/filters/bfcache.content_unittests.filter

@@ -4,6 +4,7 @@
 # the BackForwardCache.
 -FrameServiceBaseTest.DidFinishNavigation
 
+# https://crbug.com/1019077
 # Expects the process used by the previous document to exit.
 -RenderFrameHostManagerTest.DeleteFrameAfterSwapOutACK