core(lantern): duplicate isNonNetworkProtocol inside lib/lantern

core/lib/lantern/network-node.js

@@ -7,8 +7,32 @@
 import * as Lantern from './types/lantern.js';
 import {NetworkRequestTypes} from './lantern.js';
 import {BaseNode} from './base-node.js';
-// TODO(15841): bring impl of isNonNetworkRequest inside lantern and remove this.
-import UrlUtils from '../url-utils.js';
+
+const NON_NETWORK_SCHEMES = [
+  'blob', // @see https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
+  'data', // @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
+  'intent', // @see https://developer.chrome.com/docs/multidevice/android/intents/
+  'file', // @see https://en.wikipedia.org/wiki/File_URI_scheme
+  'filesystem', // @see https://developer.mozilla.org/en-US/docs/Web/API/FileSystem
+  'chrome-extension',
+];
+
+/**
+ * Use `NetworkRequest.isNonNetworkRequest(req)` if working with a request.
+ * Note: the `protocol` field from CDP can be 'h2', 'http', (not 'https'!) or it'll be url's scheme.
+ *   https://source.chromium.org/chromium/chromium/src/+/main:content/browser/devtools/protocol/network_handler.cc;l=598-611;drc=56d4a9a9deb30be73adcee8737c73bcb2a5ab64f
+ * However, a `new URL(href).protocol` has a colon suffix.
+ *   https://url.spec.whatwg.org/#dom-url-protocol
+ * A URL's `scheme` is specced as the `protocol` sans-colon, but isn't exposed on a URL object.
+ * This method can take all 3 of these string types as a parameter.
+ * @param {string} protocol Either a networkRequest's `protocol` per CDP or a `new URL(href).protocol`
+ * @return {boolean}
+ */
+function isNonNetworkProtocol(protocol) {
+  // Strip off any colon
+  const urlScheme = protocol.includes(':') ? protocol.slice(0, protocol.indexOf(':')) : protocol;
+  return NON_NETWORK_SCHEMES.includes(urlScheme);
+}
 
 /**
  * @template [T=any]
@@ -75,9 +99,9 @@ class NetworkNode extends BaseNode {
    */
   get isNonNetworkProtocol() {
     // The 'protocol' field in devtools a string more like a `scheme`
-    return UrlUtils.isNonNetworkProtocol(this.request.protocol) ||
+    return isNonNetworkProtocol(this.request.protocol) ||
       // But `protocol` can fail to be populated if the request fails, so fallback to scheme.
-      UrlUtils.isNonNetworkProtocol(this.request.parsedURL.scheme);
+      isNonNetworkProtocol(this.request.parsedURL.scheme);
   }
 
   /**