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This change refactors LocalNetworkCollector::GetSyncableNetwork to
accept a network's GUID instead of NetworkIdentifier in order to keep
logic related to local network lookups encapsulated in
LocalNetworkCollector.

Bug: 966270
Change-Id: I36946e0fbb1cfc85e972cf5169f1bf4555080f5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107062
Commit-Queue: Jon Mann <jonmann@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#753818}