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

base/supports_user_data.h

Index: base/supports_user_data.h
diff --git a/base/supports_user_data.h b/base/supports_user_data.h
index a4c7c9fc890bac0692e0d3771a97b9f9c1df401f..233ce38ce2d952430f3f0b0fb3984323c0d00e3e 100644
--- a/base/supports_user_data.h
+++ b/base/supports_user_data.h
@@ -37,8 +37,11 @@ class BASE_EXPORT SupportsUserData {
   // Multiple user data values can be stored under different keys.
   // This object will TAKE OWNERSHIP of the given data pointer, and will
   // delete the object if it is changed or the object is destroyed.
+  // TODO: remove the raw ptr version of SetUserData once everything uses
+  // the unique_ptr version, see crbug.com/690937.
   Data* GetUserData(const void* key) const;
   void SetUserData(const void* key, Data* data);
+  void SetUserData(const void* key, std::unique_ptr<Data> data);
   void RemoveUserData(const void* key);
 
   // SupportsUserData is not thread-safe, and on debug build will assert it is