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The main thread test interfers with the EarlGrey synchromization.
If a tests enables metrics, any subsequent sync will wait forever.
Disable MainThreadFreezeDetection on tests.

Bug: 1070286
Change-Id: I96381b423f9915f22015bfe1af264e3ce51697ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2151517Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759715}