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This required adding deps, which in turn created circular includes. To
address this, the patch
* moves settings_namespace.{cc,} into the //extensions/browser target
* passes the task runner from GetExtensionFileTaskRunner() as a
  parameter into value store code

Bug: 1158986
Change-Id: I91ae5c90d82c5cbe5eb1d2a62cd1dd65a003e74c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601640Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841134}