Revert r4029.

src/heap.cc

 // Copyright 2009 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 3063 matching lines @@
 }
 
 
 bool Heap::IdleNotification() {
   static const int kIdlesBeforeScavenge = 4;
   static const int kIdlesBeforeMarkSweep = 7;
   static const int kIdlesBeforeMarkCompact = 8;
   static int number_idle_notifications = 0;
   static int last_gc_count = gc_count_;
 
-  if (contexts_disposed_ > 0) {
+  if (!FLAG_expose_gc && (contexts_disposed_ > 0)) {
     HistogramTimerScope scope(&Counters::gc_context);
     CollectAllGarbage(false);
     ASSERT(contexts_disposed_ == 0);
     last_gc_count = gc_count_;
     return false;
   }
 
   bool finished = false;
 
   if (last_gc_count == gc_count_) {
@@ skipping 1144 matching lines @@
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 List<Object*> ExternalStringTable::new_space_strings_;
 List<Object*> ExternalStringTable::old_space_strings_;
 
 } }  // namespace v8::internal