Convert Pass()→std::move() in //tools

tools/gn/build_settings.cc

Index: tools/gn/build_settings.cc
diff --git a/tools/gn/build_settings.cc b/tools/gn/build_settings.cc
index 63ff35845cb7db16e87141ab9fd2d8fc867875f8..72a74c33122bde275c00635924545cc573579ead 100644
--- a/tools/gn/build_settings.cc
+++ b/tools/gn/build_settings.cc
@@ -4,6 +4,8 @@
 
 #include "tools/gn/build_settings.h"
 
+#include <utility>
+
 #include "base/files/file_util.h"
 #include "tools/gn/filesystem_utils.h"
 
@@ -60,5 +62,5 @@ base::FilePath BuildSettings::GetFullPathSecondary(
 void BuildSettings::ItemDefined(scoped_ptr<Item> item) const {
   DCHECK(item);
   if (!item_defined_callback_.is_null())
-    item_defined_callback_.Run(item.Pass());
+    item_defined_callback_.Run(std::move(item));
 }