Delete Transform1bppBitmap() after commit 2f30766.
Delete Transform1bppBitmap() after commit 2f30766.

It's unused and causing the build to fail.

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2060743004

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium