Refactor frame navigation/detach state cleanup to be more sane.

Source/core/dom/ActiveDOMObjectTest.cpp

 /*
  * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 86 matching lines @@
 TEST_F(ActiveDOMObjectTest, MoveToSuspendedDocument)
 {
     destDocument().suspendScheduledTasks();
 
     EXPECT_CALL(activeDOMObject(), suspend());
     activeDOMObject().didMoveToNewExecutionContext(&destDocument());
 }
 
 TEST_F(ActiveDOMObjectTest, MoveToStoppedDocument)
 {
-    destDocument().detach();
+    destDocument().prepareForDestruction();
 
     EXPECT_CALL(activeDOMObject(), stop());
     activeDOMObject().didMoveToNewExecutionContext(&destDocument());
 }
 
 } // unnamed namespace