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/SampleDash.cpp b/samplecode/SampleDash.cpp
index 20e2896..26d3694 100644
--- a/samplecode/SampleDash.cpp
+++ b/samplecode/SampleDash.cpp
@@ -17,8 +17,7 @@
     SkColor c = paint->getColor();
 
     SkBitmap bm;
-    bm.setConfig(SkBitmap::kARGB_8888_Config, 2, 1);
-    bm.allocPixels();
+    bm.allocN32Pixels(2, 1);
     bm.lockPixels();
     *bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
                                             SkColorGetG(c), SkColorGetB(c));