Fix ESLint failures (#34)

References #33

lib/Page.js

@@ -123,7 +123,7 @@ class Page extends EventEmitter {
         await this._client.send('Runtime.evaluate', { expression, returnByValue: true });
 
         function inPageCallback(callbackName) {
-            window[callbackName] = async (...args) => {
+            window[callbackName] = async(...args) => {
                 const me = window[callbackName];
                 let callbacks = me['callbacks'];
                 if (!callbacks) {
@@ -133,6 +133,7 @@ class Page extends EventEmitter {
                 const seq = (me['lastSeq'] || 0) + 1;
                 me['lastSeq'] = seq;
                 const promise = new Promise(fulfill => callbacks.set(seq, fulfill));
+                // eslint-disable-next-line no-console
                 console.debug('driver:InPageCallback', JSON.stringify({name: callbackName, seq, args}));
                 return promise;
             };
@@ -523,17 +524,6 @@ class Page extends EventEmitter {
     }
 }
 
-class InPageCallback {
-    /**
-     * @param {string} name
-     * @param {function(?):?} callback
-     */
-    constructor(name, callback) {
-        this.name = name;
-        this.callback = callback;
-    }
-}
-
 /** @enum {string} */
 Page.PaperFormats = {
     Letter: {width: 8.5, height: 11},