use tryAllocPixels to check the result, allocPixels to require success

Source/platform/DragImageTest.cpp

Index: Source/platform/DragImageTest.cpp
diff --git a/Source/platform/DragImageTest.cpp b/Source/platform/DragImageTest.cpp
index 9a6cb55c5d26a0d69b1c4c3b7d4263c3bd95feee..cf6c6be14a3bb0046b10809259db1d8742e0943d 100644
--- a/Source/platform/DragImageTest.cpp
+++ b/Source/platform/DragImageTest.cpp
@@ -63,7 +63,7 @@ public:
         , m_size(size)
     {
         SkBitmap bitmap;
-        EXPECT_TRUE(bitmap.allocN32Pixels(size.width(), size.height()));
+        bitmap.allocN32Pixels(size.width(), size.height());
         m_nativeImage = NativeImageSkia::create(bitmap);
     }