[DevTools] Pass sidebar and not the panel.

third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js

Index: third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js
diff --git a/third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js b/third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js
index 8c8805afa877403023ce4b007fb9029c61cdd243..3a030292d9bbea8d691b35f6e0df6b9533005604 100644
--- a/third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js
+++ b/third_party/WebKit/Source/devtools/front_end/resources/ApplicationPanelSidebar.js
@@ -611,6 +611,7 @@ Resources.BaseStorageTreeElement = class extends UI.TreeElement {
    */
   constructor(storagePanel, title, expandable) {
     super(title, expandable);
+    console.assert(storagePanel);

[dgozman, 2017/04/04 16:48:30]

It is marked as non-nullable. Don't assert.

[eostroukhov, 2017/04/04 17:31:37]

Done.

     this._storagePanel = storagePanel;
   }
 
@@ -736,7 +737,7 @@ Resources.DatabaseTreeElement = class extends Resources.BaseStorageTreeElement {
     function tableNamesCallback(tableNames) {
       var tableNamesLength = tableNames.length;
       for (var i = 0; i < tableNamesLength; ++i)
-        this.appendChild(new Resources.DatabaseTableTreeElement(this._storagePanel, this._database, tableNames[i]));
+        this.appendChild(new Resources.DatabaseTableTreeElement(this._sidebar, this._database, tableNames[i]));
     }
     this._database.getTableNames(tableNamesCallback.bind(this));
   }
@@ -746,6 +747,11 @@ Resources.DatabaseTreeElement = class extends Resources.BaseStorageTreeElement {
  * @unrestricted
  */
 Resources.DatabaseTableTreeElement = class extends Resources.BaseStorageTreeElement {
+  /**
+   * @param {!Resources.ApplicationPanelSidebar} sidebar
+   * @param {!Resources.Database} database
+   * @param {string} tableName
+   */
   constructor(sidebar, database, tableName) {
     super(sidebar._panel, tableName, false);
     this._sidebar = sidebar;