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Update the include rules for //extensions. There are many test-only
exceptions (including quite a few that violate layering). These rules
are currently applied for all tests in //extensions, but most only need
to be applied to //extensions/browser.

Trim the //extensions/DEPS include list to only have includes that are
included from multiple subdirectories, and move the rest into
//extensions/browser/DEPS and //extensions/renderer/DEPS. Also remove a
few includes that were no longer necessary, or didn't exist.

Bug: 773004

Change-Id: Ib6e705faae4472369858102e8a9ebe555e2a8d66
Reviewed-on: https://chromium-review.googlesource.com/820937
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523693}