Fix minor memory leaks

https://codereview.chromium.org/12703044/



git-svn-id: http://skia.googlecode.com/svn/trunk@8419 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/shallowgradient.cpp b/gm/shallowgradient.cpp
index 672193d..fd14943 100644
--- a/gm/shallowgradient.cpp
+++ b/gm/shallowgradient.cpp
@@ -58,7 +58,7 @@
         SkSize size = SkSize::Make(r.width(), r.height());
 
         SkPaint paint;
-        paint.setShader(fProc(colors, colorCount, size));
+        paint.setShader(fProc(colors, colorCount, size))->unref();
         canvas->drawRect(r, paint);
     }