remove legacy 33 flag -- now use canvas with 4x4 matrices

bug: skia:9768

Change-Id: Ic366b14972c13625fc83f44f6f0782bc4052f44d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988721
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Cr-Commit-Position: refs/heads/master@{#729735}

skia/config/SkUserConfig.h

@@ -211,10 +211,6 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_DISABLE_REDUCE_OPLIST_SPLITTING
 #endif
 
-#ifndef SK_SUPPORT_LEGACY_CANVAS_MATRIX_33
-#define SK_SUPPORT_LEGACY_CANVAS_MATRIX_33
-#endif
-
 #ifndef SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS
 #define SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS
 #endif