Geolocation cleanup: make GeolocationDelegate::OverrideSystemLocationProvider return unique_ptr

content/public/browser/geolocation_delegate.cc

 // 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 "content/public/browser/geolocation_delegate.h"
+#include "content/public/browser/location_provider.h"
 
 namespace content {
 
 bool GeolocationDelegate::UseNetworkLocationProviders() {
   return true;
 }
 
 AccessTokenStore* GeolocationDelegate::CreateAccessTokenStore() {
   return nullptr;
 }
 
-LocationProvider* GeolocationDelegate::OverrideSystemLocationProvider() {
+std::unique_ptr<LocationProvider>
+GeolocationDelegate::OverrideSystemLocationProvider() {
   return nullptr;
 }
 
 }  // namespace content