Remove first-use hints when runs inside emulator.

When anroid is running inside emulator, there is no need to show first-use
hints, such as "Make yourself at home". This commit skips such and similar
hints when running inside emulator.

Change-Id: Idfb253c604f8b4a202aa439957ca2618c82c333b
Merge "Remove first-use hints when runs inside emulator."