Switch SupportsUserData uses to use unique_ptr.

ios/chrome/browser/find_in_page/find_tab_helper.mm

 // Copyright 2017 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.
 
 #import "ios/chrome/browser/find_in_page/find_tab_helper.h"
 
+#include "base/memory/ptr_util.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_controller.h"
 #import "ios/chrome/browser/find_in_page/find_in_page_model.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 DEFINE_WEB_STATE_USER_DATA_KEY(FindTabHelper);
 
 // static
 void FindTabHelper::CreateForWebState(
     web::WebState* web_state,
     id<FindInPageControllerDelegate> controller_delegate) {
   DCHECK(web_state);
   if (!FromWebState(web_state)) {
-    web_state->SetUserData(UserDataKey(),
-                           new FindTabHelper(web_state, controller_delegate));
+    web_state->SetUserData(UserDataKey(), base::WrapUnique(new FindTabHelper(
+                                              web_state, controller_delegate)));
   }
 }
 
 FindTabHelper::FindTabHelper(
     web::WebState* web_state,
     id<FindInPageControllerDelegate> controller_delegate)
     : web::WebStateObserver(web_state) {
   controller_.reset([[FindInPageController alloc]
       initWithWebState:web_state
               delegate:controller_delegate]);
@@ skipping 59 matching lines @@
 }
 
 void FindTabHelper::NavigationItemCommitted(
     const web::LoadCommittedDetails& load_details) {
   StopFinding(nil);
 }
 
 void FindTabHelper::WebStateDestroyed() {
   [controller_ detachFromWebState];
 }