Renamed Zone->StackZone, BaseZone->Zone, in preparation for changing isolate->get_zone() to return …

runtime/lib/string.cc

Index: runtime/lib/string.cc
diff --git a/runtime/lib/string.cc b/runtime/lib/string.cc
index 41c3181ba654441feb3e7255655ebd422b1195fd..6b78f895862c090dea7088fad9c764a0146091c7 100644
--- a/runtime/lib/string.cc
+++ b/runtime/lib/string.cc
@@ -14,7 +14,7 @@ namespace dart {
 DEFINE_NATIVE_ENTRY(StringBase_createFromCodePoints, 1) {
   GET_NATIVE_ARGUMENT(Array, a, arguments->At(0));
   // TODO(srdjan): Check that parameterized type is an int.
-  Zone* zone = isolate->current_zone();
+  StackZone* zone = isolate->current_zone();
   intptr_t len = a.Length();
 
   // Unbox the array and determine the maximum element width.