Revert "Fix a problem that JP2 image is not displayed because index color space is used"

This reverts commit 5a0e504d53195892458d819e52c62bea0c710bd5.

Original review URL https://codereview.chromium.org/1009513003

Reason for revert: New "corpus" tests show that this is no longer rendering some images.  See, e.g. http://chromegw/i/client.pdfium/builders/linux/builds/144/steps/corpus%20tests/logs/stdio for those that diff'd.

TBR=jun_fang@foxitsoftware.com

Review URL: https://codereview.chromium.org/1016823003
2 files changed