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This change gives ExtensionManagement control over update URL used when
updating extensions. Previously only first install was affected, all
later updates used update URL from the extension manifest. Now update
URL from the policy can be used if extension management said so.
This change is split into multiple CLs.

Update URL from policy is handled in
https://chromium-review.googlesource.com/c/chromium/src/+/2593260.

Bug: b/175786074
Change-Id: I73580416d039a14abe7b91ecad50f4f8cecc8682
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596259Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Cr-Commit-Position: refs/heads/master@{#843457}