ash: Get rid of OnLocalStatePrefServiceInitialized

Get rid of OnLocalStatePrefServiceInitialized and migrate
dependent code either to get local state via contructor, or
through an accessor on Shell (when code path to the constructor
is buried deeply.)

Bug: 958237
Change-Id: I295c44933dc50fedd19b2893d3f70ae2f2f83d6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610944
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659788}
19 files changed