Some of the tests are still failing, but at least now we can go through till
the end.
- Fixed NPE in WelcomeTests (caused by the mock context not returning a proper
layout inflator.)
- Removed the rainy day test from MessageFileViewTest.
(Not setting a proper intent will result in the argument check in
MessageFileViewFragment)
- Removed unnecessary null check in EmailProvider.getDatabase()
Bug 4766072
Change-Id: I48b92cc91d0417cd9980c131fda8f63a9a6eb990
369905c95d