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DCHECKs crash the running XCTest without producing any useful log
output.  Instead, switch to XCTAssertTrue() so that an error message
will be displayed when bots are misconfigured.

BUG=1002739

Change-Id: If902ea15e2b89090fcd355ad7bfb04828e71561a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1799082
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695773}