DevTools: Remove unused variables. Disallow unused variables with eslint

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

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 493 matching lines @@
     this._liveLocationPool.disposeAll();
   }
 
   /**
    * @param {!SDK.DebuggerModel} debuggerModel
    */
   _switchToPausedTarget(debuggerModel) {
     delete this._switchToPausedTargetTimeout;
     if (this._paused)
       return;
-    var target = UI.context.flavor(SDK.Target);
     if (debuggerModel.isPaused())
       return;
     var debuggerModels = SDK.DebuggerModel.instances();
     for (var i = 0; i < debuggerModels.length; ++i) {
       if (debuggerModels[i].isPaused()) {
         UI.context.setFlavor(SDK.Target, debuggerModels[i].target());
         break;
       }
     }
   }
@@ skipping 323 matching lines @@
 
   /**
    * @param {!UI.ContextMenu} contextMenu
    * @param {!Object} object
    */
   appendUILocationItems(contextMenu, object) {
     if (!(object instanceof Workspace.UILocation))
       return;
     var uiLocation = /** @type {!Workspace.UILocation} */ (object);
     var uiSourceCode = uiLocation.uiSourceCode;
-    var projectType = uiSourceCode.project().type();
 
     var contentType = uiSourceCode.contentType();
     if (contentType.hasScripts()) {
       var target = UI.context.flavor(SDK.Target);
       var debuggerModel = SDK.DebuggerModel.fromTarget(target);
       if (debuggerModel && debuggerModel.isPaused()) {
         contextMenu.appendItem(
             Common.UIString.capitalize('Continue to ^here'), this._continueToLocation.bind(this, uiLocation));
       }
       this._callstackPane.appendBlackboxURLContextMenuItems(contextMenu, uiSourceCode);
@@ skipping 440 matching lines @@
    */
   willHide() {
     UI.inspectorView.setDrawerMinimized(false);
     setImmediate(() => Sources.SourcesPanel.updateResizerAndSidebarButtons(Sources.SourcesPanel.instance()));
   }
 
   _showViewInWrapper() {
     this._view.show(this.element);
   }
 };