replace setConfig+allocPixels with single call

tests/QuickRejectTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkDrawLooper.h"
 #include "Test.h"
@@ skipping 22 matching lines @@
     virtual void toString(SkString* str) const SK_OVERRIDE {
         str->append("TestLooper:");
     }
 #endif
 
     SK_DECLARE_UNFLATTENABLE_OBJECT()
 };
 
 static void test_drawBitmap(skiatest::Reporter* reporter) {
     SkBitmap src;
-    src.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
-    src.allocPixels();
+    src.allocN32Pixels(10, 10);
     src.eraseColor(SK_ColorWHITE);
 
     SkBitmap dst;
-    dst.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
-    dst.allocPixels();
+    dst.allocN32Pixels(10, 10);
     dst.eraseColor(SK_ColorTRANSPARENT);
 
     SkCanvas canvas(dst);
     SkPaint  paint;
 
     // we are initially transparent
     REPORTER_ASSERT(reporter, 0 == *dst.getAddr32(5, 5));
 
     // we see the bitmap drawn
     canvas.drawBitmap(src, 0, 0, &paint);
@@ skipping 12 matching lines @@
     // allows us through, even though sans-looper we would look like we should
     // be clipped out.
     paint.setLooper(new TestLooper)->unref();
     canvas.drawBitmap(src, SkIntToScalar(-10), 0, &paint);
     REPORTER_ASSERT(reporter, 0xFFFFFFFF == *dst.getAddr32(5, 5));
 }
 
 DEF_TEST(QuickReject, reporter) {
     test_drawBitmap(reporter);
 }