Explicitly set theme to all activities.

The default theme change to Holo caused a crash in MessageCompose,
because Holo has actionbar, which MessageCompose doesn't expect at
this point.  Explicitly set theme to prevent crashes.

Bug 2945294.

Change-Id: Ic5f833690eeb1048e8c4c3ac7a42c2d454c61876
1 file changed