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

src/effects/SkDropShadowImageFilter.cpp

Index: src/effects/SkDropShadowImageFilter.cpp
diff --git a/src/effects/SkDropShadowImageFilter.cpp b/src/effects/SkDropShadowImageFilter.cpp
index c79cf0bcd39bf580930a19a35266dbfa0a90b096..1d22bbdb2e41aa520677b06b53236c0c92f1518e 100644
--- a/src/effects/SkDropShadowImageFilter.cpp
+++ b/src/effects/SkDropShadowImageFilter.cpp
@@ -15,17 +15,6 @@
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
-SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigma,
-                                                 SkColor color, SkImageFilter* input)
-    : INHERITED(1, &input)
-    , fDx(dx)
-    , fDy(dy)
-    , fSigmaX(sigma)
-    , fSigmaY(sigma)
-    , fColor(color)
-{
-}
-
 SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy,
                                                  SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                                  SkImageFilter* input, const CropRect* cropRect)