Revert of Use number of components from ICC profile and alternateCS (patchset #1 of https://codereview.chromium.org/493163003/)

Reason for revert:
Needs to address comments before landing

Original issue's description:
> Use number of components from ICC profile and alternate color space
>
> BUG=406806
>
> Committed: https://pdfium.googlesource.com/pdfium/+/be83103

TBR=tsepez@chromium.org,jun_fang@foxitsoftware.com
NOTREECHECKS=true
NOTRY=true
BUG=406806

Review URL: https://codereview.chromium.org/504883003