Remove legacy 2pt conical gradient

Bug: skia:7459
Change-Id: Iccc2588f80e22b13ed5d23656b8c75d7b7058a36
Reviewed-on: https://skia-review.googlesource.com/92700
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Yuqian Li <liyuqian@google.com>
7 files changed