Revert "Implementation of image decoding for bmp files, in accordance with the new API."

This reverts commit 3675874468de7228944ce21922e6ec863f5f2310.

BUG=skia:
NOTREECHECKS=true
NOTRY=true
TBR=

Review URL: https://codereview.chromium.org/1012873002
14 files changed