DevTools: Remove unused variables. Disallow unused variables with eslint

third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
index b4a07c0bfd87bd2deb885acd9ecee77c5252f336..465526dbec70f577ad5b92dd710c77b02242058b 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/DOMModel.js
@@ -1799,16 +1799,6 @@ SDK.DOMModel = class extends SDK.SDKModel {
    * @param {function(?Protocol.Error)=} callback
    */
   undo(callback) {
-    /**
-     * @param {?Protocol.Error} error
-     * @this {SDK.DOMModel}
-     */
-    function mycallback(error) {
-      this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoCompleted);
-      callback(error);
-    }
-
-    this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoRequested);

[einbinder, 2016/12/10 00:47:37]

Nothing even uses these events.

     this._agent.undo(callback);
   }
 
@@ -1816,16 +1806,6 @@ SDK.DOMModel = class extends SDK.SDKModel {
    * @param {function(?Protocol.Error)=} callback
    */
   redo(callback) {
-    /**
-     * @param {?Protocol.Error} error
-     * @this {SDK.DOMModel}
-     */
-    function mycallback(error) {
-      this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoCompleted);
-      callback(error);
-    }
-
-    this.dispatchEventToListeners(SDK.DOMModel.Events.UndoRedoRequested);
     this._agent.redo(callback);
   }