Rollback of r14079 in trunk branch.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 1bc37f10021aa0bd9dc0c65845eba6cca5a62344..64c00220f30712a97a97be861d6af44605b5280f 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -5979,14 +5979,6 @@ void Isolate::Exit() {
 
 void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
-  if (!isolate->IsInitialized()) {
-    heap_statistics->total_heap_size_ = 0;
-    heap_statistics->total_heap_size_executable_ = 0;
-    heap_statistics->total_physical_size_ = 0;
-    heap_statistics->used_heap_size_ = 0;
-    heap_statistics->heap_size_limit_ = 0;
-    return;
-  }
   i::Heap* heap = isolate->heap();
   heap_statistics->total_heap_size_ = heap->CommittedMemory();
   heap_statistics->total_heap_size_executable_ =