I was assuming MailService.resetNewMessageCount cleared notification,
but it didn't.
Doing it in Activity.onResume is clearly wrong because we don't always
have an account ID there. If we don't, we're passing -1, which clears
all notifications for all accounts.
We're now calling resetNewMessageCount() in MessageListFragment,
when we refresh the list, so we can remove it from onResume() for the Phone
UI as well.
Bug 3074056
Change-Id: Ib0bb2fbb0309a0784fb3a525927102f423e930df
241f18f237