Update MagnifierImageFilter to sk_sp

fuzz/FilterFuzz.cpp

Index: fuzz/FilterFuzz.cpp
diff --git a/fuzz/FilterFuzz.cpp b/fuzz/FilterFuzz.cpp
index 87653a18bb3418cd53cbe3add419bbfb0a864c53..67eb0b8c47f35b5132f06c7e233366571c58ab77 100644
--- a/fuzz/FilterFuzz.cpp
+++ b/fuzz/FilterFuzz.cpp
@@ -579,8 +579,9 @@ static sk_sp<SkImageFilter> make_image_filter(bool canBeNull) {
                                          make_image_filter());
         break;
     case MAGNIFIER:
-        filter = sk_sp<SkImageFilter>(SkMagnifierImageFilter::Create(make_rect(),
-                                                                     make_scalar(true)));
+        filter = SkMagnifierImageFilter::Make(make_rect(),
+                                              make_scalar(true), 
+                                              make_image_filter());

[f(malita), 2016/04/07 13:33:42]

Third arg should be nullptr for equivalence with existing code, but I presume
this is intended as a fix.

[robertphillips, 2016/04/07 14:02:05]

Right - I believe the prior behavior was incorrect.

         break;
     case DOWN_SAMPLE:
         filter = sk_sp<SkImageFilter>(SkDownSampleImageFilter::Create(make_scalar()));