use AsMode instead of deprecated IsMode



git-svn-id: http://skia.googlecode.com/svn/trunk@2705 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkDraw.cpp b/src/core/SkDraw.cpp
index 579e29a..5ddca08 100644
--- a/src/core/SkDraw.cpp
+++ b/src/core/SkDraw.cpp
@@ -152,7 +152,7 @@
     }
 
     SkXfermode::Mode mode;
-    if (!SkXfermode::IsMode(paint.getXfermode(), &mode)) {
+    if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) {
         return NULL;
     }