Convert //tools to use std::unique_ptr

tools/gn/toolchain.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/toolchain.h"
 
 #include <stddef.h>
 #include <string.h>
 #include <utility>
 
@@ skipping 73 matching lines @@
       NOTREACHED();
       return std::string();
   }
 }
 
 const Tool* Toolchain::GetTool(ToolType type) const {
   DCHECK(type != TYPE_NONE);
   return tools_[static_cast<size_t>(type)].get();
 }
 
-void Toolchain::SetTool(ToolType type, scoped_ptr<Tool> t) {
+void Toolchain::SetTool(ToolType type, std::unique_ptr<Tool> t) {
   DCHECK(type != TYPE_NONE);
   DCHECK(!tools_[type].get());
   t->SetComplete();
   tools_[type] = std::move(t);
 }
 
 void Toolchain::ToolchainSetupComplete() {
   // Collect required bits from all tools.
   for (const auto& tool : tools_) {
     if (tool)
@@ skipping 60 matching lines @@
       return TYPE_STAMP;
     default:
       NOTREACHED();
       return Toolchain::TYPE_NONE;
   }
 }
 
 const Tool* Toolchain::GetToolForTargetFinalOutput(const Target* target) const {
   return tools_[GetToolTypeForTargetFinalOutput(target)].get();
 }