replace setConfig+allocPixels with single call

BUG=skia:

Review URL: https://codereview.chromium.org/162643002

git-svn-id: http://skia.googlecode.com/svn/trunk@13426 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/PathOpsExtendedTest.cpp b/tests/PathOpsExtendedTest.cpp
index 1083a89..cee27e4 100644
--- a/tests/PathOpsExtendedTest.cpp
+++ b/tests/PathOpsExtendedTest.cpp
@@ -289,8 +289,7 @@
 static int pathsDrawTheSame(SkBitmap& bits, const SkPath& scaledOne, const SkPath& scaledTwo,
         int& error2x2) {
     if (bits.width() == 0) {
-        bits.setConfig(SkBitmap::kARGB_8888_Config, bitWidth * 2, bitHeight);
-        bits.allocPixels();
+        bits.allocN32Pixels(bitWidth * 2, bitHeight);
     }
     SkCanvas canvas(bits);
     canvas.drawColor(SK_ColorWHITE);
@@ -355,8 +354,7 @@
     if (bitHeight >= (int) sizeof(out)) {
         return false;
     }
-    bits.setConfig(SkBitmap::kARGB_8888_Config, bitWidth * 2, bitHeight);
-    bits.allocPixels();
+    bits.allocN32Pixels(bitWidth * 2, bitHeight);
     SkCanvas canvas(bits);
     canvas.drawColor(SK_ColorWHITE);
     SkPaint paint;