fix(chromium): abort fetch requests that lack networkId (#2254)

These requests are usually internal ones, and we can safely abort them.
An example would be DevTools loading cached resources to show the content.
There will never be a matching Network.requestWillBeSent event, so we do not
report them to the user.

src/chromium/crNetworkManager.ts

@@ -140,7 +140,17 @@ export class CRNetworkManager {
         requestId: event.requestId
       }).catch(logError(this._page));
     }
-    if (!event.networkId || event.request.url.startsWith('data:'))
+    if (!event.networkId) {
+      // Fetch without networkId means that request was not recongnized by inspector, and
+      // it will never receive Network.requestWillBeSent. Most likely, this is an internal request
+      // that we can safely fail.
+      this._client.send('Fetch.failRequest', {
+        requestId: event.requestId,
+        errorReason: 'Aborted',
+      }).catch(logError(this._page));
+      return;
+    }
+    if (event.request.url.startsWith('data:'))
       return;
 
     const requestId = event.networkId;

src/frames.ts

@@ -215,8 +215,13 @@ export class FrameManager {
     this._inflightRequestStarted(request);
     for (const task of request.frame()._frameTasks)
       task.onRequest(request);
-    if (!request._isFavicon)
+    if (request._isFavicon) {
-      this._page._requestStarted(request);
+      const route = request._route();
+      if (route)
+        route.continue();
+      return;
+    }
+    this._page._requestStarted(request);
   }
 
   requestReceivedResponse(response: network.Response) {