Update from https://crrev.com/308331

base/supports_user_data.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_SUPPORTS_USER_DATA_H_
 #define BASE_SUPPORTS_USER_DATA_H_
 
 #include <map>
 
 #include "base/base_export.h"
@@ skipping 43 matching lines @@
   ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SupportsUserData);
 };
 
 // Adapter class that releases a refcounted object when the
 // SupportsUserData::Data object is deleted.
 template <typename T>
 class UserDataAdapter : public base::SupportsUserData::Data {
  public:
-  static T* Get(SupportsUserData* supports_user_data, const void* key) {
+  static T* Get(const SupportsUserData* supports_user_data, const void* key) {
     UserDataAdapter* data =
       static_cast<UserDataAdapter*>(supports_user_data->GetUserData(key));
     return data ? static_cast<T*>(data->object_.get()) : NULL;
   }
 
   UserDataAdapter(T* object) : object_(object) {}
   T* release() { return object_.release(); }
 
  private:
   scoped_refptr<T> object_;
 
   DISALLOW_COPY_AND_ASSIGN(UserDataAdapter);
 };
 
 }  // namespace base
 
 #endif  // BASE_SUPPORTS_USER_DATA_H_