use tryAllocPixels to check the result, allocPixels to require success

Source/platform/graphics/ImageLayerChromiumTest.cpp

Index: Source/platform/graphics/ImageLayerChromiumTest.cpp
diff --git a/Source/platform/graphics/ImageLayerChromiumTest.cpp b/Source/platform/graphics/ImageLayerChromiumTest.cpp
index d745c7504655f2c829854604a3f21e78b87ec7f2..9824225557594d04a21148e5025faf1facdb5ae5 100644
--- a/Source/platform/graphics/ImageLayerChromiumTest.cpp
+++ b/Source/platform/graphics/ImageLayerChromiumTest.cpp
@@ -56,7 +56,7 @@ public:
         , 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);
     }