Replace uses of legacy SkBitmap::copyTo() API

cc/ipc/struct_traits_unittest.cc

Index: cc/ipc/struct_traits_unittest.cc
diff --git a/cc/ipc/struct_traits_unittest.cc b/cc/ipc/struct_traits_unittest.cc
index 5b1b68ec77c52345cea804c0a5d97569bb488afb..3ef8418d341fe9cf73ece363afd0ddbc36cc8a0d 100644
--- a/cc/ipc/struct_traits_unittest.cc
+++ b/cc/ipc/struct_traits_unittest.cc
@@ -535,7 +535,8 @@ TEST_F(StructTraitsTest, CopyOutputResult_Bitmap) {
   bitmap->allocN32Pixels(7, 8);
   bitmap->eraseARGB(123, 213, 77, 33);
   auto in_bitmap = base::MakeUnique<SkBitmap>();
-  bitmap->deepCopyTo(in_bitmap.get());
+  in_bitmap->allocN32Pixels(7, 8);
+  in_bitmap->eraseARGB(123, 213, 77, 33);
   auto input = CopyOutputResult::CreateBitmapResult(std::move(bitmap));
   auto size = input->size();