Switch SupportsUserData uses to use unique_ptr.

ios/web/public/test/test_redirect_observer.mm

 // Copyright 2016 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.
 
 #include "ios/web/public/test/test_redirect_observer.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/supports_user_data.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
 #import "ios/web/public/web_state/web_state.h"
 
 namespace {
 // The key under which TestRedirectObservers are stored in a WebState's user
 // data.
 const void* const kTestRedirectObserverKey = &kTestRedirectObserverKey;
 }  // namespace
@@ skipping 13 matching lines @@
         static_cast<TestRedirectObserverUserDataWrapper*>(
             web_state->GetUserData(kTestRedirectObserverKey));
     if (!wrapper)
       wrapper = new TestRedirectObserverUserDataWrapper(web_state);
     return wrapper;
   }
 
   explicit TestRedirectObserverUserDataWrapper(web::WebState* web_state)
       : redirect_observer_(web_state) {
     DCHECK(web_state);
-    web_state->SetUserData(kTestRedirectObserverKey, this);
+    web_state->SetUserData(kTestRedirectObserverKey, base::WrapUnique(this));
   }
 
   web::TestRedirectObserver* redirect_observer() { return &redirect_observer_; }
 
  private:
   web::TestRedirectObserver redirect_observer_;
 };
 
 #pragma mark - TestRedirectObserver
 
@@ skipping 36 matching lines @@
     // chain for that NavigationItem.
     expected_urls_.erase(url);
     RedirectChain redirect_chain;
     redirect_chain.original_url = url;
     redirect_chain.final_url = url;
     redirect_chains_[item] = redirect_chain;
   }
 }
 
 }  // namespace web