replace setConfig+allocPixels with single call

tests/FlatDataTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
@@ skipping 50 matching lines @@
     colors[0] = SK_ColorRED;
     colors[1] = SK_ColorBLUE;
 
     SkAutoTUnref<SkShader> shader(SkGradientShader::CreateLinear(points, colors, NULL, 2,
                                                                  SkShader::kRepeat_TileMode));
     testCreate<SkFlattenableTraits>(reporter, *shader);
 
     // Test SkBitmap
     {
         SkBitmap bm;
-        bm.setConfig(SkBitmap::kARGB_8888_Config, 50, 50);
-        bm.allocPixels();
+        bm.allocN32Pixels(50, 50);
         SkCanvas canvas(bm);
         SkPaint paint;
         paint.setShader(shader);
         canvas.drawPaint(paint);
         testCreate<SkBitmapTraits>(reporter, bm);
     }
 
     // Test SkColorFilter
     SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateLightingFilter(SK_ColorBLUE, SK_ColorRED));
     testCreate<SkFlattenableTraits>(reporter, *cf);
 
     // Test SkXfermode
     SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(SkXfermode::kDstOver_Mode));
     testCreate<SkFlattenableTraits>(reporter, *xfer);
 }