replace setConfig+allocPixels with alloc-or-install-pixels

BUG=skia:
R=scroggo@google.com, halcanary@google.com, reed@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/164203003

git-svn-id: http://skia.googlecode.com/svn/trunk@13442 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/ClipperTest.cpp b/tests/ClipperTest.cpp
index c8f65db..00b6229 100644
--- a/tests/ClipperTest.cpp
+++ b/tests/ClipperTest.cpp
@@ -13,8 +13,7 @@
 
 static void test_hairclipping(skiatest::Reporter* reporter) {
     SkBitmap bm;
-    bm.setConfig(SkBitmap::kARGB_8888_Config, 4, 4);
-    bm.allocPixels();
+    bm.allocN32Pixels(4, 4);
     bm.eraseColor(SK_ColorWHITE);
 
     SkPaint paint;