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Fix and re-enable tests in c/b/r/c/a/c/b/background_test.js

R=akihiroota@chromium.org

AX-Relnotes: n/a
Fixed: 924976, 622387, 1085666
Change-Id: Id331e8cb005a54b2cbd804ac563b8c814bc80668
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585680Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836257}