change all factories to return their base-class

include/effects/SkBlurDrawLooper.h

Index: include/effects/SkBlurDrawLooper.h
diff --git a/include/effects/SkBlurDrawLooper.h b/include/effects/SkBlurDrawLooper.h
index 808557b9da7f2a2f47b40d5d5b7bcc568d735309..930af15ff8fe7fe67373fdd03e98673db8654fe2 100644
--- a/include/effects/SkBlurDrawLooper.h
+++ b/include/effects/SkBlurDrawLooper.h
@@ -35,8 +35,8 @@ public:
         kAll_BlurFlag               = 0x07
     };
 
-    static SkBlurDrawLooper* Create(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
-                                    uint32_t flags = kNone_BlurFlag) {
+    static SkDrawLooper* Create(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
+                                uint32_t flags = kNone_BlurFlag) {
         return new SkBlurDrawLooper(color, sigma, dx, dy, flags);
     }