Convert Pass()→std::move() in //tools

tools/gn/scope.h

Index: tools/gn/scope.h
diff --git a/tools/gn/scope.h b/tools/gn/scope.h
index 0b9bfbe48be1c3bf0dae3075ff434fc1b31c78cd..7b329412450ab24ecdf7369faa58c33c41ed84d6 100644
--- a/tools/gn/scope.h
+++ b/tools/gn/scope.h
@@ -7,6 +7,7 @@
 
 #include <map>
 #include <set>
+#include <utility>
 
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
@@ -240,7 +241,7 @@ class Scope {
   const PatternList* GetSourcesAssignmentFilter() const;
   void set_sources_assignment_filter(
       scoped_ptr<PatternList> f) {
-    sources_assignment_filter_ = f.Pass();
+    sources_assignment_filter_ = std::move(f);
   }
 
   // Indicates if we're currently processing the build configuration file.