make allocPixels throw on failure

tests/CachedDecodingPixelRefTest.cpp

 /*
  * Copyright 2013 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 "SkCachingPixelRef.h"
 #include "SkCanvas.h"
@@ skipping 330 matching lines @@
         }
         if (NULL == image.get()) {
             ERRORF(r, "SkImage::NewFromGenerator unexpecedly failed ["
                    SK_SIZE_T_SPECIFIER "]", i);
             continue;
         }
         REPORTER_ASSERT(r, TestImageGenerator::Width() == image->width());
         REPORTER_ASSERT(r, TestImageGenerator::Height() == image->height());
 
         SkBitmap bitmap;
-        SkAssertResult(bitmap.allocN32Pixels(TestImageGenerator::Width(),
-                                             TestImageGenerator::Height()));
+        bitmap.allocN32Pixels(TestImageGenerator::Width(), TestImageGenerator::Height());
         SkCanvas canvas(bitmap);
         const SkColor kDefaultColor = 0xffabcdef;
         canvas.clear(kDefaultColor);
         image->draw(&canvas, 0, 0, NULL);
         if (TestImageGenerator::kSucceedGetPixels_TestType == test) {
             REPORTER_ASSERT(
                     r, TestImageGenerator::Color() == *bitmap.getAddr32(0, 0));
         } else {
             REPORTER_ASSERT(r, kDefaultColor == bitmap.getColor(0,0));
         }
     }
 }