base: DocumentUI: fix a few issues handling remote content

http://jira.omnirom.org/browse/OMNI-956
http://jira.omnirom.org/browse/OMNI-950

Change-Id: I8d50d71a9c91486dfc9e5da01538c6b5a626f054
SystemUI: add missing status bar image

Change-Id: Icaf4d179b538818f5782637d403de212d0e0a841
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4

Sync