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This CL fixes flaky
LoadingPredictorBrowserTest.PrepareForPageLoadWithPrediction test.

If a navigation finishes earlier than the PreconnectManager completes all
its preresolve jobs, remaining jobs will be cancelled and the test will fail by
timeout. This CL uses TestNavigationManager that pauses navigations to avoid
this race.

Bug: 902963
Change-Id: I6aea05b3518627f7bbef0af18bb89bb1b1463f81
Reviewed-on: https://chromium-review.googlesource.com/c/1325984Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606419}