Extern visualRefresh per request.

Fixes issue 1087
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51931323
Fix typos in device_sensor_event externs.

Community contribution from Frederic Junod.
Fixes issue 1084.
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Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=51963442
Merge remote-tracking branch: upstream/master