Move JSSyntaxRegExp to core as a private member. This removes the last refrences to dart:coreimpl.

runtime/vm/bootstrap_nocorelib.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap.h"
 
 #include "include/dart_api.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_bootstrap, false, "Print the bootstrap source.");
 
 
 RawScript* Bootstrap::LoadCoreScript(bool is_patch) {
   UNREACHABLE();
   return Script::null();
 }
 
 
-RawScript* Bootstrap::LoadCoreImplScript(bool is_patch) {
-  UNREACHABLE();
-  return Script::null();
-}
-
-
 RawScript* Bootstrap::LoadCollectionScript(bool is_patch) {
   UNREACHABLE();
   return Script::null();
 }
 
 
 RawScript* Bootstrap::LoadMathScript(bool is_patch) {
   UNREACHABLE();
   return Script::null();
 }
@@ skipping 16 matching lines @@
   return Script::null();
 }
 
 
 RawError* Bootstrap::Compile(const Library& library, const Script& script) {
   UNREACHABLE();
   return Error::null();
 }
 
 }  // namespace dart