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Currently, the pref delegate in network quality estimator (NQE) reads
network quality prefs right after startup. However, the underlying pref
service factory is initialized asynchronously by the network_context
(see the linked bug). This results in pref delegate read at startup
returning empty value, irrespective of the actual prefs.

This CL fixes the bug by changing pref delegate to read the pref only
after the pref service has been initialized. This ensures that
when the prefs are read, they actually return what's stored on the
disk, instead of empty values.

Change-Id: I9791c673c0300d6d896f2d8e556c97f01f7e1f52
Bug: 904465
Reviewed-on: https://chromium-review.googlesource.com/c/1333127
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608544}