Change trail from GrowableObjectArray to ZoneGrowableArray.

runtime/vm/class_finalizer.h

Index: runtime/vm/class_finalizer.h
diff --git a/runtime/vm/class_finalizer.h b/runtime/vm/class_finalizer.h
index de8cdde95c6c2bec2a00d9759b748da3217f0dfd..c44989bc108471ec0a89e16ed5a6a389f2da102f 100644
--- a/runtime/vm/class_finalizer.h
+++ b/runtime/vm/class_finalizer.h
@@ -7,23 +7,10 @@
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
+#include "vm/object.h"
 
 namespace dart {
 
-class AbstractType;
-class Class;
-class Error;
-class Function;
-class GrowableObjectArray;
-class MixinAppType;
-class RawAbstractType;
-class RawClass;
-class RawType;
-class Script;
-class Type;
-class TypeArguments;
-class UnresolvedClass;
-
 // Traverses all pending, unfinalized classes, validates and marks them as
 // finalized.
 class ClassFinalizer : public AllStatic {
@@ -149,7 +136,7 @@ class ClassFinalizer : public AllStatic {
                                     intptr_t num_uninitialized_arguments,
                                     Error* bound_error,
                                     GrowableObjectArray* pending_types,
-                                    GrowableObjectArray* trail);
+                                    TrailPtr trail);
   static void CheckRecursiveType(const Class& cls,
                                  const Type& type,
                                  GrowableObjectArray* pending_types);