Fixes onFocus to not early exit before mode switching logic.
onFocus duplicates some logic from onEventDefault which early exits when in Classic mode and the target node is within web content. This causes problems because onEventDefault sets-up the current mode then performs the classic check. This caused us to never switch on Compat mode in certain cases where we don't get a load complete from a webview during OOBE that we have whitelisted for Compat.
BUG=514270
Review URL: https://codereview.chromium.org/
1257013005
Cr-Commit-Position: refs/heads/master@{#341811}