GitLab

1. Add missing ContentClient initialization in ContentTestSuite
in death child process case. Repeater does not notify events to test
listeners in death child process by design.
2. Add proper appcache tests teardown to avoid leaking test setup
configuration to other test, potentially causing crashes if other tests
in batch created response without headers. The config enabled relevant
headers checking code, which expects headers to exist.

BUG=604078

Change-Id: I05adb10ce30a1324ba2a80054808bd0697feb4c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2478603Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819477}