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File policy_browsertest.cc contains integration tests for many unrelated
policies, that makes this test file extremely large. It's better to
split it into several parts according to testing section. This commit
starts with splitting work by moving extension-related policy tests into
separate file.

Possible follow-up improvement could be: extract other sections into
different files, leaving only generic policy tests in
policy_browsertest.cc. Another possible follow-up: refactor PolicyTest
base test class, eg., by moving its extension-related methods into new
subclass in extension_policy_browsertest.cc.

Bug: 1002483
Change-Id: I97f6286fd5ba0ba681fa95fc1f85107da4fe246c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763667
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697157}