DevTools: remove BreakpointsSidebarPaneBase and breakpointsList.css

third_party/WebKit/Source/devtools/front_end/sources/JavaScriptBreakpointsSidebarPane.js

 // Copyright (c) 2015 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 {UI.ContextFlavorListener}
  * @unrestricted
  */
 Sources.JavaScriptBreakpointsSidebarPane = class extends UI.ThrottledWidget {
   constructor() {
     super(true);
-    this.registerRequiredCSS('components/breakpointsList.css');
+    this.registerRequiredCSS('sources/javaScriptBreakpointsSidebarPane.css');
 
     this._breakpointManager = Bindings.breakpointManager;
     this._breakpointManager.addEventListener(Bindings.BreakpointManager.Events.BreakpointAdded, this.update, this);
     this._breakpointManager.addEventListener(Bindings.BreakpointManager.Events.BreakpointRemoved, this.update, this);
     this._breakpointManager.addEventListener(
         Bindings.BreakpointManager.Events.BreakpointsActiveStateChanged, this.update, this);
 
     /** @type {?Element} */
     this._listElement = null;
     this.update();
@@ skipping 197 matching lines @@
     this.update();
   }
 
   _didUpdateForTest() {
   }
 };
 
 Sources.JavaScriptBreakpointsSidebarPane._locationSymbol = Symbol('location');
 Sources.JavaScriptBreakpointsSidebarPane._checkboxLabelSymbol = Symbol('checkbox-label');
 Sources.JavaScriptBreakpointsSidebarPane._snippetElementSymbol = Symbol('snippet-element');