Revert "Update clipboard API calls to use clipboard permissions."

This reverts commit ba383e4bb1330749c36483b7b5b994a1f5281848.

Reason for revert: Causing WebClipboardImplTest.ImageCopy to fail on Cast Audio Linux:
https://ci.chromium.org/buildbot/chromium.linux/Cast%20Audio%20Linux/7455

Original change's description:
> Update clipboard API calls to use clipboard permissions.
> 
> This adds permission checks to make sure that the user has granted
> appropriate permission for the clipboard API methods.
> 
> Bug: 677564
> Change-Id: I5af221b0e18d45509ff2a8c3856680e598a51dcb
> Reviewed-on: https://chromium-review.googlesource.com/804973
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Raymes Khoury <raymes@chromium.org>
> Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
> Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#525516}

TBR=raymes@chromium.org,dcheng@chromium.org,garykac@chromium.org,piman@chromium.org,foolip@chromium.org

Change-Id: Ic41c03a8e2acd737fe709626f0938e18cf341565
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 677564
Reviewed-on: https://chromium-review.googlesource.com/838340
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525538}
15 files changed