Do not delete blink::WebRTCCertificateCallback on non-main thread

base/memory/ptr_util.h

 // Copyright 2015 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_MEMORY_PTR_UTIL_H_
 #define BASE_MEMORY_PTR_UTIL_H_
 
 #include <memory>
 #include <utility>
 
 namespace base {
 
 // Helper to transfer ownership of a raw pointer to a std::unique_ptr<T>.
 // Note that std::unique_ptr<T> has very different semantics from
 // std::unique_ptr<T[]>: do not use this helper for array allocations.
-template <typename T>
-std::unique_ptr<T> WrapUnique(T* ptr) {
-  return std::unique_ptr<T>(ptr);
+template <typename T, typename D = std::default_delete<T>>
+std::unique_ptr<T, D> WrapUnique(T* ptr, D deleter = D()) {
+  return std::unique_ptr<T, D>(ptr, std::move(deleter));
 }
 
 namespace internal {
 
 template <typename T>
 struct MakeUniqueResult {
   using Scalar = std::unique_ptr<T>;
 };
 
 template <typename T>
@@ skipping 36 matching lines @@
 }
 
 // Overload to reject array types of known bound, e.g. T[n].
 template <typename T, typename... Args>
 typename internal::MakeUniqueResult<T>::Invalid MakeUnique(Args&&... args) =
     delete;
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_PTR_UTIL_H_