use tryAllocPixels to check the result, allocPixels to require success

Source/platform/graphics/ImageLayerChromiumTest.cpp

 /*
  * Copyright (C) 2011 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 38 matching lines @@
     static PassRefPtr<TestImage> create(const IntSize& size, bool isOpaque)
     {
         return adoptRef(new TestImage(size, isOpaque));
     }
 
     explicit TestImage(const IntSize& size, bool isOpaque)
         : Image(0)
         , m_size(size)
     {
         SkBitmap bitmap;
-        EXPECT_TRUE(bitmap.allocN32Pixels(size.width(), size.height(), isOpaque));
+        bitmap.allocN32Pixels(size.width(), size.height(), isOpaque);
         m_nativeImage = NativeImageSkia::create(bitmap);
     }
 
     virtual bool isBitmapImage() const OVERRIDE
     {
         return true;
     }
 
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE
     {
@@ skipping 72 matching lines @@
     ASSERT_FALSE(graphicsLayer->contentsLayer());
 
     graphicsLayer->setContentsToImage(opaqueImage.get());
     ASSERT_TRUE(graphicsLayer->contentsLayer()->opaque());
 
     graphicsLayer->setContentsToImage(nonOpaqueImage.get());
     ASSERT_FALSE(graphicsLayer->contentsLayer()->opaque());
 }
 
 } // namespace