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An event listener could destroy the context when it's notified (e.g.,
if it does window.close()). We need to account for this case. Check
after each listener is executed whether the context is still valid.

Add native bindings-specific unittests and a JS/Native bindings
browsertest.

Bug: 653596

Change-Id: I47e789800ca90935457781695d3e8c3de7aae317
Reviewed-on: https://chromium-review.googlesource.com/818528Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524466}