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

runtime/bin/dartutils.h

 // 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.
 
 #ifndef BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 #include "include/dart_api.h"
@@ skipping 108 matching lines @@
 
   static void SetOriginalWorkingDirectory();
 
   // Global state that stores the original working directory..
   static const char* original_working_directory;
 
   static const char* kDartScheme;
   static const char* kDartExtensionScheme;
   static const char* kBuiltinLibURL;
   static const char* kCoreLibURL;
-  static const char* kCoreImplLibURL;
   static const char* kCryptoLibURL;
   static const char* kIOLibURL;
   static const char* kIOLibPatchURL;
   static const char* kJsonLibURL;
   static const char* kUriLibURL;
   static const char* kUtfLibURL;
   static const char* kIsolateLibURL;
   static const char* kScalarlistLibURL;
   static const char* kWebLibURL;
 
@@ skipping 230 matching lines @@
   void* Peer() const { return cobject_->value.as_external_byte_array.peer; }
   Dart_PeerFinalizer Callback() const {
     return cobject_->value.as_external_byte_array.callback;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CObjectExternalUint8Array);
 };
 
 #endif  // BIN_DARTUTILS_H_