Move heap profiler state flags to HeapProfiler

src/heap-snapshot-generator.cc

Index: src/heap-snapshot-generator.cc
diff --git a/src/heap-snapshot-generator.cc b/src/heap-snapshot-generator.cc
index 7e74d86ae3a8973992f9ee8ac596e6c59e9241e1..79a1516412876ce898853d652969e35f8228a726 100644
--- a/src/heap-snapshot-generator.cc
+++ b/src/heap-snapshot-generator.cc
@@ -747,8 +747,7 @@ size_t HeapObjectsMap::GetUsedMemorySize() const {
 
 
 HeapSnapshotsCollection::HeapSnapshotsCollection(Heap* heap)
-    : is_tracking_objects_(false),
-      names_(heap),
+    : names_(heap),
       ids_(heap),
       allocation_tracker_(NULL) {
 }
@@ -770,7 +769,6 @@ void HeapSnapshotsCollection::StartHeapObjectsTracking() {
   if (allocation_tracker_ == NULL) {
     allocation_tracker_ = new AllocationTracker(&ids_, names());
   }
-  is_tracking_objects_ = true;
 }
 
 
@@ -785,7 +783,6 @@ void HeapSnapshotsCollection::StopHeapObjectsTracking() {
 
 HeapSnapshot* HeapSnapshotsCollection::NewSnapshot(const char* name,
                                                    unsigned uid) {
-  is_tracking_objects_ = true;  // Start watching for heap objects moves.
   return new HeapSnapshot(this, name, uid);
 }