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LockObserver browser tests were disabled on Android Kit Kat
because of flaky failures of the navigation performed in
SetUpOnMainThread(). Since it is not important to perform the
navigation from SetUpOnMainThread(), this CL moves it to the
test body.

The failure seems related to this comment:
https://cs.chromium.org/chromium/src/content/public/test/browser_test_base.cc?l=650-664&rcl=786a9194459684dc7a6fded9cabfc0c9b9b37174

This CL also removes the ContentMockCertVerifier in
LockManager browser tests, and instead specifies the
switches::kIgnoreCertificateErrors command-line flag,
which is simpler.

Bug: 1011765, 1014015
Change-Id: Ia1e140605a6734a95012f5c6019c6cef4918f372
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1854901
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709888}