Cherry pick: [Android] Ignore isSystemKey from the framework.

BUG: 14438911

Upstream bug description:
[Android] Ignore isSystemKey from the framework.

Force isSystemKey flag to false as the Android framework is changing
this behavior and this is breaking DPAD keys.

Review URL: https://codereview.chromium.org/267903005/

Change-Id: Ic0711886412640696ad9cfca04877046a6b588bb
1 file changed