Merge to XFA: Cleanup: Get this rid of "this->" in fpdfsdk/

Also remove commented out code and trailing whitespaces.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1179653005.

(cherry picked from commit eda202769e5c79eba1d2fb5090f6e9cf176e2d4a)

Review URL: https://codereview.chromium.org/1187733002.
33 files changed