[Extensions Bindings] Remove TestConfig.nativeCrxBindingsEnabled

Remove nativeCrxBindingsEnabled from the TestConfig object in the
chrome.test extension API. Since native bindings are now always
enabled, we don't need this boolean.

Update JS files that were using it.

Bug: 938998, 792602
Change-Id: Ica1e78b4c7a2e86258977e9c7939181ff3a8cec8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518147
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640951}
6 files changed