Update constructors view when switching perspectives

Source/devtools/front_end/HeapSnapshotDataGrids.js

Index: Source/devtools/front_end/HeapSnapshotDataGrids.js
diff --git a/Source/devtools/front_end/HeapSnapshotDataGrids.js b/Source/devtools/front_end/HeapSnapshotDataGrids.js
index 92e7d08563f41280312aee8f9dbefc1e5d23efb1..da4bc852aac01658a89347f938facf177fdd6cb5 100644
--- a/Source/devtools/front_end/HeapSnapshotDataGrids.js
+++ b/Source/devtools/front_end/HeapSnapshotDataGrids.js
@@ -769,6 +769,13 @@ WebInspector.HeapSnapshotConstructorsDataGrid.prototype = {
         this.snapshot.nodeClassName(parseInt(id, 10), didGetClassName.bind(this));
     },
 
+    clear: function()
+    {
+        this._nextRequestedFilter = null;
+        this._lastFilter = null;
+        this.removeTopLevelNodes();
+    },
+
     setDataSource: function(snapshot)
     {
         this.snapshot = snapshot;