remove flag for SK_SUPPORT_LEGACY_TILED_BITMAPS

May require (slight) rebaselining, as the legacy code may differ from
the raster pipeline precision.

Change-Id: I54878dfa59e2dd6c5a7eb6ff9c5f278ec6eff726
Reviewed-on: https://chromium-review.googlesource.com/c/1280790
Commit-Queue: Mike Reed <reed@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600541}

skia/config/SkUserConfig.h

@@ -151,10 +151,6 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION
 #endif
 
-#ifndef SK_SUPPORT_LEGACY_TILED_BITMAPS
-#define SK_SUPPORT_LEGACY_TILED_BITMAPS
-#endif
-
 // Max. verb count for paths rendered by the edge-AA tessellating path renderer.
 #define GR_AA_TESSELLATOR_MAX_VERB_COUNT 100