Avoid some crashes when running without snapshots.

test/cctest/test-debug.cc

 // Copyright 2011 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 411 matching lines @@
   // information stored for the debugger.
   CHECK(Isolate::Current()->debug()->debug_context().is_null());
   CHECK_EQ(NULL, Isolate::Current()->debug()->debug_info_list_);
 
   // Collect garbage to ensure weak handles are cleared.
   HEAP->CollectAllGarbage(i::Heap::kNoGCFlags);
   HEAP->CollectAllGarbage(i::Heap::kMakeHeapIterableMask);
 
   // Iterate the head and check that there are no debugger related objects left.
   HeapIterator iterator;
-  for (HeapObject* obj = iterator.Next(); obj != NULL; obj = iterator.Next()) {
+  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
     CHECK(!obj->IsDebugInfo());
     CHECK(!obj->IsBreakPointInfo());
 
     // If deep check of functions is requested check that no debug break code
     // is left in all functions.
     if (check_functions) {
       if (obj->IsJSFunction()) {
         JSFunction* fun = JSFunction::cast(obj);
         for (RelocIterator it(fun->shared()->code()); !it.done(); it.next()) {
           RelocInfo::Mode rmode = it.rinfo()->rmode();
@@ skipping 6852 matching lines @@
   TestDebugBreakInLoop("for (;;) {", loop_bodies, "}");
   TestDebugBreakInLoop("for (;a == 1;) {", loop_bodies, "}");
 
   // Get rid of the debug event listener.
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
 
 #endif  // ENABLE_DEBUGGER_SUPPORT