replace SkBitmap::Config with SkColorType in gms

gm/bitmapfilters.cpp

Index: gm/bitmapfilters.cpp
diff --git a/gm/bitmapfilters.cpp b/gm/bitmapfilters.cpp
index 5856f87f66de158b765a309396fae12a8870faef..7addf25c012e263297f88fa4fa33b9207d13ab01 100644
--- a/gm/bitmapfilters.cpp
+++ b/gm/bitmapfilters.cpp
@@ -20,8 +20,9 @@ static void make_bm(SkBitmap* bm) {
     }
     SkColorTable* ctable = new SkColorTable(colorsPM, 4);
 
-    bm->setConfig(SkBitmap::kIndex8_Config, 2, 2);
-    bm->allocPixels(ctable);
+    bm->allocPixels(SkImageInfo::Make(2, 2, kIndex_8_SkColorType,
+                                      kPremul_SkAlphaType),
+                    NULL, ctable);
     ctable->unref();
 
     *bm->getAddr8(0, 0) = 0;