fix(firefox): fire "requestfailed" event on network errors (#1817)

Author: yury-s

package.json

@@ -9,7 +9,7 @@
   "main": "index.js",
   "playwright": {
     "chromium_revision": "759546",
-    "firefox_revision": "1082",
+    "firefox_revision": "1083",
     "webkit_revision": "1197"
   },
   "scripts": {

test/network.spec.js

@@ -241,10 +241,10 @@ describe('Network Events', function() {
     expect(responses[0].request()).toBeTruthy();
   });
 
-  it.fail(FFOX)('Page.Events.RequestFailed', async({page, server}) => {
+  it('Page.Events.RequestFailed', async({page, server}) => {
     server.setRoute('/one-style.css', (req, res) => {
-      req.socket.write('deadbeef');
-      req.socket.end();
+      res.setHeader('Content-Type', 'text/css');
+      res.socket.destroy();
     });
     const failedRequests = [];
     page.on('requestfailed', request => failedRequests.push(request));
@@ -254,7 +254,7 @@ describe('Network Events', function() {
     expect(await failedRequests[0].response()).toBe(null);
     expect(failedRequests[0].resourceType()).toBe('stylesheet');
     if (CHROMIUM) {
-      expect(failedRequests[0].failure().errorText).toBe('net::ERR_INVALID_HTTP_RESPONSE');
+      expect(failedRequests[0].failure().errorText).toBe('net::ERR_EMPTY_RESPONSE');
     } else if (WEBKIT) {
       if (MAC)
         expect(failedRequests[0].failure().errorText).toBe('The network connection was lost.');
@@ -263,7 +263,7 @@ describe('Network Events', function() {
       else
         expect(failedRequests[0].failure().errorText).toBe('Message Corrupt');
     } else {
-      expect(failedRequests[0].failure().errorText).toBe('NS_ERROR_FAILURE');
+      expect(failedRequests[0].failure().errorText).toBe('NS_ERROR_NET_RESET');
     }
     expect(failedRequests[0].frame()).toBeTruthy();
   });