Remove ScopedVector from tools/gn/.

tools/gn/loader.cc

 // Copyright (c) 2013 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 "tools/gn/loader.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/err.h"
@@ skipping 260 matching lines @@
     our_scope.CheckForUnusedVars(&err);
 
   if (err.has_error()) {
     if (!origin.is_null())
       err.AppendSubErr(Err(origin, "which caused the file to be included."));
     g_scheduler->FailWithError(err);
   }
 
 
   // Pass all of the items that were defined off to the builder.
-  for (auto*& item : collected_items) {
-    settings->build_settings()->ItemDefined(base::WrapUnique(item));
-    item = nullptr;
-  }
+  for (auto& item : collected_items)
+    settings->build_settings()->ItemDefined(std::move(item));
 
   trace.Done();
 
   task_runner_->PostTask(FROM_HERE, base::Bind(&LoaderImpl::DidLoadFile, this));
 }
 
 void LoaderImpl::BackgroundLoadBuildConfig(
     Settings* settings,
     const Scope::KeyValueMap& toolchain_overrides,
     const ParseNode* root) {
@@ skipping 130 matching lines @@
     const SourceFile& file_name,
     const base::Callback<void(const ParseNode*)>& callback,
     Err* err) {
   if (async_load_file_.is_null()) {
     return g_scheduler->input_file_manager()->AsyncLoadFile(
         origin, build_settings, file_name, callback, err);
   }
   return async_load_file_.Run(
       origin, build_settings, file_name, callback, err);
 }