Update SupportsUserData uses with unique_ptr.

components/pdf/browser/pdf_web_contents_helper.cc

Index: components/pdf/browser/pdf_web_contents_helper.cc
diff --git a/components/pdf/browser/pdf_web_contents_helper.cc b/components/pdf/browser/pdf_web_contents_helper.cc
index fdbea015a2059615c76d9ae627f17acd9e78a6b8..64b814bfe29419105ea9f0e53460cd7016b88c8c 100644
--- a/components/pdf/browser/pdf_web_contents_helper.cc
+++ b/components/pdf/browser/pdf_web_contents_helper.cc
@@ -7,6 +7,7 @@
 #include <utility>
 
 #include "base/bind.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/pdf/browser/pdf_web_contents_helper_client.h"
 
@@ -20,8 +21,9 @@ void PDFWebContentsHelper::CreateForWebContentsWithClient(
     std::unique_ptr<PDFWebContentsHelperClient> client) {
   if (FromWebContents(contents))
     return;
-  contents->SetUserData(UserDataKey(),
-                        new PDFWebContentsHelper(contents, std::move(client)));
+  contents->SetUserData(
+      UserDataKey(),
+      base::WrapUnique(new PDFWebContentsHelper(contents, std::move(client))));
 }
 
 PDFWebContentsHelper::PDFWebContentsHelper(