Fix build.

runtime/vm/code_patcher_ia32.cc

Index: runtime/vm/code_patcher_ia32.cc
diff --git a/runtime/vm/code_patcher_ia32.cc b/runtime/vm/code_patcher_ia32.cc
index 45f39238fc6e0c6cc5e353765ee5040704c4300e..d0b0a3e5e4353dfed5fa011ac804e021ac2c5a49 100644
--- a/runtime/vm/code_patcher_ia32.cc
+++ b/runtime/vm/code_patcher_ia32.cc
@@ -163,7 +163,7 @@ void CodePatcher::PatchStaticCallAt(uword return_address,
                                     const Code& code,
                                     const Code& new_target) {
   const Instructions& instrs = Instructions::Handle(code.instructions());
-  WritableInstructionsScope writable(instrs.PayloadStart(), instrs.size());
+  WritableInstructionsScope writable(instrs.PayloadStart(), instrs.Size());
   ASSERT(code.ContainsInstructionAt(return_address));
   StaticCall call(return_address);
   call.set_target(new_target);