Convert //tools to use std::unique_ptr

tools/gn/scope.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/scope.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/template.h"
@@ skipping 362 matching lines @@
       }
     }
 
     // Be careful to delete any pointer we're about to clobber.
     dest->templates_[current_name] = pair.second;
   }
 
   return true;
 }
 
-scoped_ptr<Scope> Scope::MakeClosure() const {
-  scoped_ptr<Scope> result;
+std::unique_ptr<Scope> Scope::MakeClosure() const {
+  std::unique_ptr<Scope> result;
   if (const_containing_) {
     // We reached the top of the mutable scope stack. The result scope just
     // references the const scope (which will never change).
     result.reset(new Scope(const_containing_));
   } else if (mutable_containing_) {
     // There are more nested mutable scopes. Recursively go up the stack to
     // get the closure.
     result = mutable_containing_->MakeClosure();
   } else {
     // This is a standalone scope, just copy it.
@@ skipping 117 matching lines @@
 }
 
 void Scope::AddProvider(ProgrammaticProvider* p) {
   programmatic_providers_.insert(p);
 }
 
 void Scope::RemoveProvider(ProgrammaticProvider* p) {
   DCHECK(programmatic_providers_.find(p) != programmatic_providers_.end());
   programmatic_providers_.erase(p);
 }