use safeUnref() since the other macro is not defined in donut
diff --git a/core/jni/android/graphics/Shader.cpp b/core/jni/android/graphics/Shader.cpp
index 8dbe83f..b09c62b 100644
--- a/core/jni/android/graphics/Shader.cpp
+++ b/core/jni/android/graphics/Shader.cpp
@@ -43,7 +43,7 @@
 
 static void Shader_destructor(JNIEnv* env, jobject, SkShader* shader)
 {
-    SkSafeUnref(shader);
+    shader->safeUnref();
 }
 
 static bool Shader_getLocalMatrix(JNIEnv* env, jobject, const SkShader* shader, SkMatrix* matrix)