Revert Dart_PropagateError until I can track down the problems in

runtime/vm/cpu_arm.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/globals.h"
 
 #if defined(TARGET_ARCH_ARM)
 
 #if defined(HOST_ARCH_ARM)
 #include <sys/syscall.h>  /* NOLINT */
@@ skipping 22 matching lines @@
 
 void CPU::JumpToExceptionHandler(uword program_counter,
                                  uword stack_pointer,
                                  uword frame_pointer,
                                  const Instance& exception_object,
                                  const Instance& stacktrace_object) {
   UNIMPLEMENTED();
 }
 
 
-void CPU::JumpToErrorHandler(
+void CPU::JumpToUnhandledExceptionHandler(
     uword program_counter,
     uword stack_pointer,
     uword frame_pointer,
-    const Error& error) {
+    const UnhandledException& unhandled_exception) {
   UNIMPLEMENTED();
 }
 
 
 const char* CPU::Id() {
   return "arm";
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM