replace setConfig+allocPixels with single call

tests/GradientTest.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 "SkBitmapDevice.h"
 #include "SkColorShader.h"
 #include "SkEmptyShader.h"
@@ skipping 124 matching lines @@
         { SkIntToScalar(10), 0 }
     };
     SkColor colors[] = { SK_ColorBLUE, SK_ColorBLUE };
     const SkScalar pos[] = { 0, SK_Scalar1 };
     SkAutoTUnref<SkShader> s(SkGradientShader::CreateLinear(pts,
                                                             colors,
                                                             pos,
                                                             2,
                                                             SkShader::kClamp_TileMode));
     SkBitmap outBitmap;
-    outBitmap.setConfig(SkBitmap::kARGB_8888_Config, 10, 1);
-    outBitmap.allocPixels();
+    outBitmap.allocN32Pixels(10, 1);
     SkPaint paint;
     paint.setShader(s.get());
-    SkBitmapDevice device(outBitmap);
-    SkCanvas canvas(&device);
+    SkCanvas canvas(outBitmap);
     canvas.drawPaint(paint);
     SkAutoLockPixels alp(outBitmap);
     for (int i = 0; i < 10; i++) {
         // The following is commented out because it currently fails
         // Related bug: https://code.google.com/p/skia/issues/detail?id=1098
 
         // REPORTER_ASSERT(reporter, SK_ColorBLUE == outBitmap.getColor(i, 0));
     }
 }
 
@@ skipping 28 matching lines @@
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(gProcs); ++i) {
         gProcs[i](reporter, rec);
     }
 }
 
 DEF_TEST(Gradient, reporter) {
     TestGradientShaders(reporter);
     TestConstantGradient(reporter);
 }