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Moved the browsertests of safe browsing policies  and content settings policies and all related stuff from policy_browsertests to separate files.

Bug: 1002483
Change-Id: If7a659bb7256ef3593802bb12cc89735bd636cfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929225
Commit-Queue: Aya Elsayed <ayaelattar@google.com>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718577}