Revert "Tell grit 2x scale is supported when enable_hidpi is set."

This reverts commit de1a884ad5a36b6e61dbf03cd75d03578bc1bd2f.

Reason for revert: Breaks external projects

Original change's description:
> Tell grit 2x scale is supported when enable_hidpi is set.
> 
> To avoid decreasing the supported platforms from today, this expands
> enable_hidpi from Linux (incl. CrOS)/Mac/Win to also include iOS.
> 
> Bug: 564112
> Change-Id: I246ea0dd25d93a174195489c2e388e3c7a890e8c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670357
> Commit-Queue: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Rohit Rao <rohitrao@chromium.org>
> Reviewed-by: Robert Flack <flackr@chromium.org>
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#672639}

TBR=sadrul@chromium.org,rohitrao@chromium.org,pkasting@chromium.org,flackr@chromium.org

Change-Id: Ic6a100b0ab085a93378cdbbc32078fb01d294317
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 564112
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1679987
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672903}
2 files changed