Update SupportsUserData uses with unique_ptr.

content/renderer/internal_document_state_data.h

Index: content/renderer/internal_document_state_data.h
diff --git a/content/renderer/internal_document_state_data.h b/content/renderer/internal_document_state_data.h
index 9e2062382644dea5a6f7c89b4d863f736b74e34d..806ea3d1f00ccf89281adef6df85c0c8255950d6 100644
--- a/content/renderer/internal_document_state_data.h
+++ b/content/renderer/internal_document_state_data.h
@@ -26,6 +26,7 @@ class DocumentState;
 class InternalDocumentStateData : public base::SupportsUserData::Data {
  public:
   InternalDocumentStateData();
+  ~InternalDocumentStateData() override;
 
   static InternalDocumentStateData* FromDataSource(blink::WebDataSource* ds);
   static InternalDocumentStateData* FromDocumentState(DocumentState* ds);
@@ -77,9 +78,6 @@ class InternalDocumentStateData : public base::SupportsUserData::Data {
     return cache_policy_override_set_;
   }
 
- protected:
-  ~InternalDocumentStateData() override;
-
  private:
   int http_status_code_;
   GURL searchable_form_url_;