Remove legacy precision boundary

Bug: skia:7731
Change-Id: I86a87b960541c2bc7b099ca9f609342cb0bbf563
Reviewed-on: https://skia-review.googlesource.com/115652
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
diff --git a/src/core/SkCoverageDelta.h b/src/core/SkCoverageDelta.h
index 1375489..62dee61 100644
--- a/src/core/SkCoverageDelta.h
+++ b/src/core/SkCoverageDelta.h
@@ -107,13 +107,8 @@
 
 class SkCoverageDeltaMask {
 public:
-#ifdef SK_SUPPORT_LEGACY_PRECISION_BOUNDARY
-    // 1 for precision error, 1 for boundary delta (e.g., -SK_Fixed1 at fBounds.fRight + 1)
-    static constexpr int PADDING        = 2;
-#else
     // 3 for precision error, 1 for boundary delta (e.g., -SK_Fixed1 at fBounds.fRight + 1)
     static constexpr int PADDING        = 4;
-#endif
 
     static constexpr int SIMD_WIDTH     = 8;
     static constexpr int SUITABLE_WIDTH = 32;