use SkColorType instead of SkBitmap::Config in samplecode

BUG=skia:
R=reed@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/169063002

git-svn-id: http://skia.googlecode.com/svn/trunk@13473 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleTextureDomain.cpp b/samplecode/SampleTextureDomain.cpp
index 854df6e..47a3ab0 100644
--- a/samplecode/SampleTextureDomain.cpp
+++ b/samplecode/SampleTextureDomain.cpp
@@ -13,8 +13,7 @@
 
 static SkBitmap make_bitmap() {
     SkBitmap bm;
-    bm.setConfig(SkBitmap::kARGB_8888_Config , 5, 5);
-    bm.allocPixels();
+    bm.allocN32Pixels(5, 5);
 
     for (int y = 0; y < bm.height(); y++) {
         uint32_t* p = bm.getAddr32(0, y);