Remove deprecated IllegalJSRegExpException class.

runtime/lib/regexp.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 "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
@@ skipping 36 matching lines @@
 }
 
 
 DEFINE_NATIVE_ENTRY(JSSyntaxRegExp_getGroupCount, 1) {
   const JSRegExp& regexp = JSRegExp::CheckedHandle(arguments->NativeArgAt(0));
   ASSERT(!regexp.IsNull());
   if (regexp.is_initialized()) {
     return regexp.num_bracket_expressions();
   }
   const String& pattern = String::Handle(regexp.pattern());
-  const String& errmsg =
-      String::Handle(String::New("Regular expression is not initialized yet"));
-  const Array& args = Array::Handle(Array::New(2));
-  args.SetAt(0, pattern);
-  args.SetAt(1, errmsg);
-  Exceptions::ThrowByType(Exceptions::kIllegalJSRegExp, args);
+  const String& errmsg = String::Handle(
+      String::New("Regular expression is not initialized yet. "));
+  const String& message = String::Handle(String::Concat(errmsg, pattern));
+  const Array& args = Array::Handle(Array::New(1));
+  args.SetAt(0, message);
+  Exceptions::ThrowByType(Exceptions::kFormat, args);
   return Object::null();
 }
 
 
 DEFINE_NATIVE_ENTRY(JSSyntaxRegExp_ExecuteMatch, 3) {
   const JSRegExp& regexp = JSRegExp::CheckedHandle(arguments->NativeArgAt(0));
   ASSERT(!regexp.IsNull());
   GET_NON_NULL_NATIVE_ARGUMENT(String, str, arguments->NativeArgAt(1));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_index, arguments->NativeArgAt(2));
   return Jscre::Execute(regexp, str, start_index.Value());
 }
 
 }  // namespace dart