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This reverts commit 55f62f27.

Reason for revert: causes QuickActionsViewTest.LocatePhoneToggle failures 
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/20941

Original change's description:
> [CrOS PhoneHub] Disable Locate Phone button when Silence Phone is on.
>
> - Add an observer for state change in Silence Phone so that Locate Phone
> can be disable when Silence Phone is on.
> - Refactor InitQuickActionsItems() since Locate Phone and Silence Phone
> is no longer independent.
>
> BUG=1106937,1126208
>
> Change-Id: I6f015e868d6d00df6a40447de62f3efd0b2f2ad0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480662
> Reviewed-by: Tim Song <tengs@chromium.org>
> Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
> Commit-Queue: Andre Le <leandre@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#819161}

TBR=khorimoto@chromium.org,tengs@chromium.org,leandre@chromium.org

Change-Id: Ibcaef1859c90cdfd1b4fb4ff1bf686e28601787f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1106937
Bug: 1126208
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489304Reviewed-by: Anatoliy Potapchuk <apotapchuk@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819303}