mark SkRasterPipelineBlitter final

This devirtualizes the call from blitAntiH to blitH,
and makes sure no future self calls will be virtual.

Change-Id: I2a277bbc1450a96e07794791792d59e5f806bde0
Reviewed-on: https://skia-review.googlesource.com/17418
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/src/core/SkRasterPipelineBlitter.cpp b/src/core/SkRasterPipelineBlitter.cpp
index 026b92b..82a202b 100644
--- a/src/core/SkRasterPipelineBlitter.cpp
+++ b/src/core/SkRasterPipelineBlitter.cpp
@@ -18,7 +18,7 @@
 #include "SkUtils.h"
 #include "../jumper/SkJumper.h"
 
-class SkRasterPipelineBlitter : public SkBlitter {
+class SkRasterPipelineBlitter final : public SkBlitter {
 public:
     // Create using paint.getShader() or paint.getColor() if there is no shader.
     // If there's a shader, we will modulate the shader color by the paint alpha.