DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/Tests.js

Index: third_party/WebKit/Source/devtools/front_end/Tests.js
diff --git a/third_party/WebKit/Source/devtools/front_end/Tests.js b/third_party/WebKit/Source/devtools/front_end/Tests.js
index 62714a8b6212ab928eb509721ba13ff499c877aa..5e94b313d98023fcd4015245a3f3ac67ac4ee2bb 100644
--- a/third_party/WebKit/Source/devtools/front_end/Tests.js
+++ b/third_party/WebKit/Source/devtools/front_end/Tests.js
@@ -302,12 +302,6 @@
   TestSuite.prototype.testNoScriptDuplicatesOnPanelSwitch = function() {
     var test = this;
 
-    // There should be two scripts: one for the main page and another
-    // one which is source of console API(see
-    // InjectedScript._ensureCommandLineAPIInstalled).
-    var expectedScriptsCount = 2;
-    var parsedScripts = [];
-
     function switchToElementsTab() {
       test.showPanel('elements').then(function() {
         setTimeout(switchToScriptsTab, 0);
@@ -573,7 +567,6 @@
     this._waitForTargets(2, callback.bind(this));
 
     function callback() {
-      var target = SDK.targetManager.targets(SDK.Target.Capability.JS)[0];
       InspectorBackendClass.deprecatedRunAfterPendingDispatches(this.releaseControl.bind(this));
     }
   };