Remove the single-sigma version of SkDropShadowImageFilter::Create().

gm/imagefiltersbase.cpp

Index: gm/imagefiltersbase.cpp
diff --git a/gm/imagefiltersbase.cpp b/gm/imagefiltersbase.cpp
index 0760fcda760e1cbf8a6024040d3b0ec440a6539e..c270e67ee33af43a0f9ba7216b809338d2d11334 100644
--- a/gm/imagefiltersbase.cpp
+++ b/gm/imagefiltersbase.cpp
@@ -198,7 +198,7 @@ protected:
             FailImageFilter::Create(),
             SkColorFilterImageFilter::Create(cf),
             SkBlurImageFilter::Create(12.0f, 0.0f),
-            SkDropShadowImageFilter::Create(10.0f, 5.0f, 3.0f, SK_ColorBLUE),
+            SkDropShadowImageFilter::Create(10.0f, 5.0f, 3.0f, 3.0f, SK_ColorBLUE),
         };
         cf->unref();