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The generated api_registration files use a lot of headers
in chrome/browser/extensions, creating a dependency cycle.
I see no obvious way to break the cycle so this just makes
it official.

There were also a couple of files in chrome/browser/accessibility
which were used from api registration, creating an unpleasant
dependency. That was fixed by putting those files in extensions
instead of in chrome/browser.

The missing dependencies triggered a lot of gn errors with a gn fixed
to look at generated files (gn:57).

The list is about 60 reports like:

ERROR at //out/Default/gen/chrome/browser/extensions/api/generated_api_registration.cc:7:11: Include not allowed.
          ^--------------------------------------------------------------------------------
It is not in any dependency of
  //chrome/browser/extensions/api:api_registration
The include file is in the target(s):
  //chrome/browser/extensions:extensions
which should somehow be reachable.

Bug: 655123
Change-Id: Ifc7809de17c9a426d2a6abdb41ecc42996b0d01f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529095Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#644715}