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This reverts commit adf05659.

Reason for revert: Removing the HEAD request. See https://crbug/874194.

Original change's description:
> [NTP] Separate internal custom link updates from user changes
> 
> When a default URL scheme is updated after URL validation, it is counted
> as a user action. This causes "Undo" to revert the URL scheme update
> instead of the user's add/update action.
> 
> Add an additional parameter to CustomLinksManager::UpdateLink in order
> to distinguish between internal and user changes. Internal changes will
> not update the previous state that is restored when
> CustomLinksManager::UndoAction is called.
> 
> Bug: 896143
> Change-Id: I643679fab5e546fac7e41214af6ff8a4ba9c8b53
> Reviewed-on: https://chromium-review.googlesource.com/c/1287259
> Commit-Queue: Kristi Park <kristipark@chromium.org>
> Reviewed-by: Marc Treib <treib@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#600988}

TBR=treib@chromium.org,kristipark@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 896143
Change-Id: I26fd1f3a92161fe06009681ff90b5ea65c2db2b7
Reviewed-on: https://chromium-review.googlesource.com/c/1298553Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602536}