Fix typo in #undef parameter

BUG=None
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/17176003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15217 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.cc

@@ -2099,7 +2099,7 @@ bool Isolate::Init(Deserializer* des) {
   isolate_addresses_[Isolate::k##CamelName##Address] =          \
       reinterpret_cast<Address>(hacker_name##_address());
   FOR_EACH_ISOLATE_ADDRESS_NAME(ASSIGN_ELEMENT)
-#undef C
+#undef ASSIGN_ELEMENT
 
   string_tracker_ = new StringTracker();
   string_tracker_->isolate_ = this;