Revert of Oilpan: Enable lazy sweeping on non-oilpan builds

Source/platform/heap/ThreadState.cpp

 /*
  * Copyright (C) 2013 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 658 matching lines @@
     Platform::current()->currentThread()->scheduler()->postNonNestableIdleTask(FROM_HERE, WTF::bind<double>(&ThreadState::performIdleGC, this));
     setGCState(IdleGCScheduled);
 }
 
 void ThreadState::scheduleIdleLazySweep()
 {
     // Idle complete sweep is supported only in the main thread.
     if (!isMainThread())
         return;
 
+    // TODO(haraken): Remove this. Lazy sweeping is not yet enabled in non-oilpan builds.
+#if ENABLE(OILPAN)
     Platform::current()->currentThread()->scheduler()->postIdleTask(FROM_HERE, WTF::bind<double>(&ThreadState::performIdleLazySweep, this));
+#endif
 }
 
 void ThreadState::schedulePreciseGC()
 {
     if (isSweepingInProgress()) {
         setGCState(SweepingAndPreciseGCScheduled);
         return;
     }
 
     setGCState(PreciseGCScheduled);
@@ skipping 204 matching lines @@
 #if defined(ADDRESS_SANITIZER)
 // TODO(haraken): Currently we cannot enable the poisoning because we have
 // real bugs where destructors touch other on-heap objects. Remove all the bugs
 // and enable the poisoning.
 #if 0
     for (int i = 0; i < NumberOfHeaps; i++)
         m_heaps[i]->poisonUnmarkedObjects();
 #endif
 #endif
 
+#if ENABLE(OILPAN)
     if (gcState() == EagerSweepScheduled) {
         // Eager sweeping should happen only in testing.
         setGCState(Sweeping);
         completeSweep();
     } else {
         // The default behavior is lazy sweeping.
         setGCState(Sweeping);
         scheduleIdleLazySweep();
     }
+#else
+    // FIXME: For now, we disable lazy sweeping in non-oilpan builds
+    // to avoid unacceptable behavior regressions on trunk.
+    setGCState(Sweeping);
+    completeSweep();
+#endif
 
 #if ENABLE(GC_PROFILING)
     snapshotFreeListIfNecessary();
 #endif
 }
 
 void ThreadState::completeSweep()
 {
     // If we are not in a sweeping phase, there is nothing to do here.
     if (!isSweepingInProgress())
@@ skipping 375 matching lines @@
         json->beginArray(it->key.ascii().data());
         for (size_t age = 0; age <= maxHeapObjectAge; ++age)
             json->pushInteger(it->value.ages[age]);
         json->endArray();
     }
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("blink_gc"), statsName, this, json.release());
 }
 #endif
 
 } // namespace blink