Revert of [Devtools] Moved flatten children to children nodes instead of datagrid

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
index 0fff370f8a1d4b2124a282b0b8a0d4f9dbb0d7a3..7c41cb9129e6dcc6a7784e9d7e9c1abe89d089fa 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
@@ -504,7 +504,6 @@
   }
 
   _setupDataGrid() {
-    /** @type {!UI.SortableDataGrid} */
     this._dataGrid = this._columns.dataGrid();
     this._dataGrid.setRowContextMenuCallback(
         (contextMenu, node) => this.handleContextMenuForRequest(contextMenu, node.request()));
@@ -521,8 +520,7 @@
    * @param {!Event} event
    */
   _dataGridMouseMove(event) {
-    var node = /** @type {?Network.NetworkDataGridNode} */ (
-        this._dataGrid.dataGridNodeFromNode(/** @type {!Node} */ (event.target)));
+    var node = this._dataGrid.dataGridNodeFromNode(event.target);
     var highlightInitiatorChain = event.shiftKey;
     this._setHoveredNode(node, highlightInitiatorChain);
     this._highlightInitiatorChain((highlightInitiatorChain && node) ? node.request() : null);
@@ -786,7 +784,7 @@
    * @return {!Array<!Network.NetworkDataGridNode>}
    */
   flatNodesList() {
-    return this._dataGrid.rootNode().flattenChildren();
+    return this._dataGrid.flatNodesList();
   }
 
   _refresh() {