Mojom structs for copy requests / results should map to unique_ptr

cc/output/copy_output_request.h

Index: cc/output/copy_output_request.h
diff --git a/cc/output/copy_output_request.h b/cc/output/copy_output_request.h
index 2bc0b4d0c7b244f716cf0df8c3afa77ecc3e4dbb..112daa40dcefe08ad0b4c567badf096b378e2778 100644
--- a/cc/output/copy_output_request.h
+++ b/cc/output/copy_output_request.h
@@ -47,8 +47,6 @@ class CC_EXPORT CopyOutputRequest {
       const CopyOutputRequest& original_request,
       const CopyOutputRequestCallback& result_callback);
 
-  CopyOutputRequest();
-
   ~CopyOutputRequest();
 
   bool IsEmpty() const { return result_callback_.is_null(); }
@@ -87,8 +85,9 @@ class CC_EXPORT CopyOutputRequest {
 
  private:
   friend struct mojo::StructTraits<mojom::CopyOutputRequestDataView,
-                                   CopyOutputRequest>;
+                                   std::unique_ptr<CopyOutputRequest>>;
 
+  CopyOutputRequest();
   CopyOutputRequest(bool force_bitmap_result,
                     const CopyOutputRequestCallback& result_callback);
 
@@ -97,6 +96,8 @@ class CC_EXPORT CopyOutputRequest {
   base::Optional<gfx::Rect> area_;
   base::Optional<TextureMailbox> texture_mailbox_;
   CopyOutputRequestCallback result_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(CopyOutputRequest);
 };
 
 }  // namespace cc