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/SampleOvalTest.cpp b/samplecode/SampleOvalTest.cpp
index a105b82..ef9c20d 100644
--- a/samplecode/SampleOvalTest.cpp
+++ b/samplecode/SampleOvalTest.cpp
@@ -22,8 +22,7 @@
     OvalTestView() {
         fSize.set(SK_Scalar1, SK_Scalar1);
 
-        fBitmap.setConfig(SkBitmap::kARGB_8888_Config, kILimit, kILimit);
-        fBitmap.allocPixels();
+        fBitmap.allocN32Pixels(kILimit, kILimit);
 
         fInsideColor = SkPreMultiplyColor(SK_ColorRED);
         fOutsideColor = SkPreMultiplyColor(SK_ColorGREEN);