Update SupportsUserData API to accept std::unique_ptr<>.

base/supports_user_data_unittest.cc

Index: base/supports_user_data_unittest.cc
diff --git a/base/supports_user_data_unittest.cc b/base/supports_user_data_unittest.cc
index faa814091cb4d1f4c91a2e25598739e9687db673..959e5a418041739796c4a167f57fd130363b95a8 100644
--- a/base/supports_user_data_unittest.cc
+++ b/base/supports_user_data_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "base/memory/ptr_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
@@ -30,8 +31,8 @@ struct UsesItself : public SupportsUserData::Data {
 TEST(SupportsUserDataTest, ClearWorksRecursively) {
   TestSupportsUserData supports_user_data;
   char key = 0;
-  supports_user_data.SetUserData(&key,
-                                 new UsesItself(&supports_user_data, &key));
+  supports_user_data.SetUserData(
+      &key, base::MakeUnique<UsesItself>(&supports_user_data, &key));
   // Destruction of supports_user_data runs the actual test.
 }