Bug 863646 - Force layout initialization in XPCOM initialization. r=bsmedberg
Back out bug 863646 for make check orange (TestStartupCache).
Back out bug 860438 nsWindowWatcher patch for ProfileManager crashes.

This reverts commit 2aec46b29d41c457b5b192ff51a448eb98598e20.
No bug, Automated blocklist update from host bld-linux64-ix-016 - a=blocklist-update
Merge mozilla-central into mozilla-inbound