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

tools/gn/target_generator.cc

Index: tools/gn/target_generator.cc
diff --git a/tools/gn/target_generator.cc b/tools/gn/target_generator.cc
index 975ff722414da3881ae401c05028fce1db92fbc5..db7befcab947fb6e3758c6f9b9e97e8ba93c8db8 100644
--- a/tools/gn/target_generator.cc
+++ b/tools/gn/target_generator.cc
@@ -126,7 +126,7 @@ void TargetGenerator::GenerateTarget(Scope* scope,
     *err = Err(function_call, "Can't define a target in this context.");
     return;
   }
-  collector->push_back(new scoped_ptr<Item>(target.PassAs<Item>()));
+  collector->push_back(target.release());
 }
 
 const BuildSettings* TargetGenerator::GetBuildSettings() const {