Update SupportsUserData uses with unique_ptr.

components/sessions/ios/ios_live_tab.mm

 // 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.
 
 #include "components/sessions/ios/ios_live_tab.h"
+#include "base/memory/ptr_util.h"
 #include "ios/web/public/navigation_manager.h"
 
 namespace {
 const char kIOSLiveTabWebStateUserDataKey[] = "ios_live_tab";
 }
 
 namespace sessions {
 
 std::string IOSLiveTab::user_agent_override_;
 
 // static
 IOSLiveTab* IOSLiveTab::GetForWebState(web::WebState* web_state) {
   if (!web_state->GetUserData(kIOSLiveTabWebStateUserDataKey)) {
     web_state->SetUserData(kIOSLiveTabWebStateUserDataKey,
-                           new IOSLiveTab(web_state));
+                           base::WrapUnique(new IOSLiveTab(web_state)));
   }
 
   return static_cast<IOSLiveTab*>(
       web_state->GetUserData(kIOSLiveTabWebStateUserDataKey));
 }
 
 IOSLiveTab::IOSLiveTab(web::WebState* web_state) : web_state_(web_state) {}
 
 IOSLiveTab::~IOSLiveTab() {}
 
@@ skipping 22 matching lines @@
 int IOSLiveTab::GetEntryCount() {
   return navigation_manager()->GetItemCount();
 }
 
 const std::string& IOSLiveTab::GetUserAgentOverride() const {
   // Dynamic user agent overrides are not supported on iOS.
   return user_agent_override_;
 }
 
 }  // namespace sessions