Remove deprecated dart:utf library.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 7933 matching lines @@
 RawLibrary* Library::NativeWrappersLibrary() {
   return Isolate::Current()->object_store()->native_wrappers_library();
 }
 
 
 RawLibrary* Library::TypedDataLibrary() {
   return Isolate::Current()->object_store()->typed_data_library();
 }
 
 
-RawLibrary* Library::UtfLibrary() {
-  return Isolate::Current()->object_store()->utf_library();
-}
-
-
 const char* Library::ToCString() const {
   const char* kFormat = "Library:'%s'";
   const String& name = String::Handle(url());
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, name.ToCString()) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, name.ToCString());
   return chars;
 }
 
 
@@ skipping 7632 matching lines @@
   return "_MirrorReference";
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   JSONObject jsobj(stream);
 }
 
 
 }  // namespace dart