Reset old generation limit on main frame context disposal.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 86d48a243bb5eacba91fabb0dfef120af4745939..cf67dab2b406ade3d21c99059e3a6b405aebe8dd 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -864,7 +864,10 @@ bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
 
 
 int Heap::NotifyContextDisposed(bool dependant_context) {
-  // TODO(hpayer): Reset heap shrinking if dependant_context is false.
+  if (!dependant_context) {
+    tracer()->ResetSurvivalEvents();
+    old_generation_size_configured_ = false;
+  }
   if (isolate()->concurrent_recompilation_enabled()) {
     // Flush the queued recompilation tasks.
     isolate()->optimizing_compiler_thread()->Flush();