use tryAllocPixels to check the result, allocPixels to require success

Source/core/frame/ImageBitmapTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
 #include "wtf/OwnPtr.h"
 
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class ImageBitmapTest : public ::testing::Test {
 protected:
     virtual void SetUp()
     {
-        ASSERT_TRUE(m_bitmap.allocN32Pixels(10, 10));
+        m_bitmap.allocN32Pixels(10, 10);
         m_bitmap.eraseColor(0xFFFFFFFF);
 
-        ASSERT_TRUE(m_bitmap2.allocN32Pixels(5, 5));
+        m_bitmap2.allocN32Pixels(5, 5);
         m_bitmap2.eraseColor(0xAAAAAAAA);
 
         // Save the global memory cache to restore it upon teardown.
         m_globalMemoryCache = replaceMemoryCacheForTesting(MemoryCache::create());
     }
     virtual void TearDown()
     {
         // Garbage collection is required prior to switching out the
         // test's memory cache; image resources are released, evicting
         // them from the cache.
@@ skipping 133 matching lines @@
     {
         RefPtrWillBeRawPtr<ImageBitmap> imageBitmapFromCanvas = ImageBitmap::create(canvasElement.get(), IntRect(0, 0, canvasElement->width(), canvasElement->height()));
         imageBitmapDerived = ImageBitmap::create(imageBitmapFromCanvas.get(), IntRect(0, 0, 20, 20));
     }
     CanvasRenderingContext* context = canvasElement->getContext("2d");
     TrackExceptionState exceptionState;
     toCanvasRenderingContext2D(context)->drawImage(imageBitmapDerived.get(), 0, 0, exceptionState);
 }
 
 } // namespace