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This reverts commit 42e67c12.

Reason for revert: Changed API to use one method to get all content types.

Original change's description:
> Add async methods to ClipboardRecentContent for URLs
> 
> Bug: 1098722
> Change-Id: Icd9da0e758c288a44716fb6f5a505267a76f42b1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302756
> Commit-Queue: Robbie Gibson <rkgibson@google.com>
> Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#789987}

TBR=olivierrobin@chromium.org,rkgibson@google.com

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

Bug: 1098722
Change-Id: I12f08509596dbf534072296dd03b977a57f9ee48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2323682Reviewed-by: Robbie Gibson <rkgibson@google.com>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#792307}