Reverting 3159, 3151 and 3150

src/handles.cc

Index: src/handles.cc
===================================================================
--- src/handles.cc	(revision 3173)
+++ src/handles.cc	(working copy)
@@ -105,21 +105,6 @@
 }
 
 
-Address HandleScope::current_extensions_address() {
-  return reinterpret_cast<Address>(&current_.extensions);
-}
-
-
-Address HandleScope::current_next_address() {
-  return reinterpret_cast<Address>(&current_.next);
-}
-
-
-Address HandleScope::current_limit_address() {
-  return reinterpret_cast<Address>(&current_.limit);
-}
-
-
 Handle<FixedArray> AddKeysFromJSArray(Handle<FixedArray> content,
                                       Handle<JSArray> array) {
   CALL_HEAP_FUNCTION(content->AddKeysFromJSArray(*array), FixedArray);