[Android] Fix the leaked IntentReceiver error.

Open the file browser or Gallery to select file in crosswalk
for instrumentation test, the current activity was paused,
wait for a moment, there is a leaked IntentReceiver error.

The fix is to remove the onresume action in setUp(), add the
onpause and onresume action.

BUG=https://crosswalk-project.org/jira/browse/XWALK-664