Don't quit debugger when the program terminates, only after `quit`.

pkg/dartino_compiler/lib/vm_context.dart

 // Copyright (c) 2015, the Dartino 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.md file.
 
 library dartino.vm_session;
 
 import 'dart:async';
 
 import 'dart:typed_data' show
     ByteData;
@@ skipping 457 matching lines @@
 
       case VmCommandCode.ProcessCompileTimeError:
         interactiveExitCode = exit_codes.DART_VM_EXITCODE_COMPILE_TIME_ERROR;
         running = false;
         break;
 
       case VmCommandCode.ProcessTerminated:
         interactiveExitCode = 0;
         running = false;
         loaded = false;
-        // TODO(ahe): Let the caller terminate the session. See issue 67.
-        await terminate();
+        terminated = true;
         break;
 
       case VmCommandCode.ConnectionError:
         interactiveExitCode = exit_codes.COMPILER_EXITCODE_CONNECTION_ERROR;
         running = false;
         loaded = false;
         await shutdown();
         terminated = true;
         break;
 
@@ skipping 491 matching lines @@
   }
 
   bool toggleInternal() {
     debugState.showInternalFrames = !debugState.showInternalFrames;
     if (debugState.currentBackTrace != null) {
       debugState.currentBackTrace.visibilityChanged();
     }
     return debugState.showInternalFrames;
   }
 }