Unify most of our utf8 implementations. This takes the implementation

runtime/bin/gen_snapshot.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.
 
 // Generate a snapshot file after loading all the scripts specified on the
 // command line.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 270 matching lines @@
     VerifyLoaded(library);
     // This is a generic dart snapshot which needs builtin library setup.
     library = LoadGenericSnapshotCreationScript(Builtin::kBuiltinLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kIOLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kJsonLibrary);
     VerifyLoaded(library);
     library = LoadGenericSnapshotCreationScript(Builtin::kUriLibrary);
     VerifyLoaded(library);
-    library = LoadGenericSnapshotCreationScript(Builtin::kUtf8Library);
+    library = LoadGenericSnapshotCreationScript(Builtin::kUtfLibrary);
     VerifyLoaded(library);
   }
 
   uint8_t* buffer = NULL;
   intptr_t size = 0;
   // First create the snapshot.
   result = Dart_CreateSnapshot(&buffer, &size);
   if (Dart_IsError(result)) {
     const char* err_msg = Dart_GetError(result);
     fprintf(stderr, "Error while creating snapshot: %s\n", err_msg);
     Dart_ExitScope();
     Dart_ShutdownIsolate();
     exit(255);
   }
   // Now write the snapshot out to specified file and exit.
   WriteSnapshotFile(buffer, size);
   Dart_ExitScope();
 
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   return 0;
 }