Simplify ScopedVector<scoped_ptr<T>> to ScopedVector<T>.

tools/gn/scope.h

 // 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.
 
 #ifndef TOOLS_GN_SCOPE_H_
 #define TOOLS_GN_SCOPE_H_
 
 #include <map>
 #include <set>
 
@@ skipping 22 matching lines @@
 // more containing scopes.
 //
 // A containing scope can be const or non-const. The const containing scope is
 // used primarily to refer to the master build config which is shared across
 // many invocations. A const containing scope, however, prevents us from
 // marking variables "used" which prevents us from issuing errors on unused
 // variables. So you should use a non-const containing scope whenever possible.
 class Scope {
  public:
   typedef base::hash_map<base::StringPiece, Value> KeyValueMap;
-  // Holds an owning list of scoped_ptrs of Items (since we can't make a vector
-  // of scoped_ptrs).
-  typedef ScopedVector< scoped_ptr<Item> > ItemVector;
+  // Holds an owning list of Items.
+  typedef ScopedVector<Item> ItemVector;
 
   // Allows code to provide values for built-in variables. This class will
   // automatically register itself on construction and deregister itself on
   // destruction.
   class ProgrammaticProvider {
    public:
     ProgrammaticProvider(Scope* scope) : scope_(scope) {
       scope_->AddProvider(this);
     }
     ~ProgrammaticProvider() {
@@ skipping 292 matching lines @@
 
   typedef std::set<ProgrammaticProvider*> ProviderSet;
   ProviderSet programmatic_providers_;
 
   SourceDir source_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(Scope);
 };
 
 #endif  // TOOLS_GN_SCOPE_H_