DevTools: Remove unused TimelineTreeModeView class

Change-Id: I1c1b22016f0f5830c619471b9a2f0081ccb58511
Reviewed-on: https://chromium-review.googlesource.com/981446Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546144}

third_party/WebKit/Source/devtools/BUILD.gn

@@ -740,7 +740,6 @@ all_devtools_files = [
   "front_end/timeline/timelinePanel.css",
   "front_end/timeline/TimelinePanel.js",
   "front_end/timeline/timelineStatusDialog.css",
-  "front_end/timeline/TimelineTreeModeView.js",
   "front_end/timeline/TimelineTreeView.js",
   "front_end/timeline/TimelineUIUtils.js",
   "front_end/timeline/PerformanceMonitor.js",

third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeModeView.js

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @implements {Timeline.TimelineModeView}
- */
-Timeline.TimelineTreeModeView = class extends UI.VBox {
-  /**
-   * @param {!Timeline.TimelineModeViewDelegate} delegate
-   * @param {!Timeline.TimelineTreeView} innerTreeView
-   */
-  constructor(delegate, innerTreeView) {
-    super();
-    this._treeView = innerTreeView;
-    this._treeView.show(this.element);
-  }
-
-  /**
-   * @override
-   * @return {?Element}
-   */
-  resizerElement() {
-    return null;
-  }
-
-  /**
-   * @override
-   * @param {?SDK.TracingModel.Event} event
-   */
-  highlightEvent(event) {
-  }
-
-  /**
-   * @override
-   * @param {?Timeline.PerformanceModel} model
-   */
-  setModel(model) {
-    this._treeView.setModel(model);
-  }
-
-  /**
-   * @override
-   */
-  setSelection() {
-  }
-
-  /**
-   * @override
-   * @param {number} startTime
-   * @param {number} endTime
-   */
-  setWindowTimes(startTime, endTime) {
-    this._treeView.setRange(startTime, endTime);
-  }
-
-  /**
-   * @override
-   * @return {!UI.Widget}
-   */
-  view() {
-    return this;
-  }
-};

third_party/WebKit/Source/devtools/front_end/timeline/module.json

@@ -255,7 +255,6 @@
         "TimelineFlameChartNetworkDataProvider.js",
         "TimelineFlameChartView.js",
         "TimelineHistoryManager.js",
-        "TimelineTreeModeView.js",
         "TimelineTreeView.js",
         "EventsTimelineTreeView.js",
         "TimelineUIUtils.js",