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This reverts commit 2752e8be.

Reason for revert: 
This has since been removed from other platforms. 
The easiest and most transparent way to remove this flag is to revert this CL.

Original change's description:
> SearchProviderLogos: Add about:flags entry for UseDdljsonApi on iOS
> 
> This is basically the iOS version of
> https://chromium-review.googlesource.com/c/600309.
> It'll make manual testing of the feature much easier.
> 
> Bug: 690467
> Change-Id: I46656106f42821346bb323c655296e63e4ddd2b1
> Reviewed-on: https://chromium-review.googlesource.com/602129
> Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
> Commit-Queue: Marc Treib <treib@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#492020}

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

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

Bug: 690467
Change-Id: I48510ac9539f101bd6927c161473b71185af7af1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095399Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748321}