Remove the requestRange/requestFull methods from the NetworkManager class

Originally the code in this file was used in both the GENERIC and MOZCENTRAL builds, however that's no longer the case.
Hence we can now directly call `NetworkManager.prototype.request` and remove these old "helper" methods that only had a single call-site each.

Author: Snuffleupagus

src/display/network.js

@@ -52,21 +52,6 @@ class NetworkManager {
     this.pendingRequests = Object.create(null);
   }
 
-  requestRange(begin, end, listeners) {
-    const args = {
-      begin,
-      end,
-    };
-    for (const prop in listeners) {
-      args[prop] = listeners[prop];
-    }
-    return this.request(args);
-  }
-
-  requestFull(listeners) {
-    return this.request(listeners);
-  }
-
   request(args) {
     const xhr = new XMLHttpRequest();
     const xhrId = this.currXhrId++;
@@ -248,14 +233,13 @@ class PDFNetworkStreamFullRequestReader {
   constructor(manager, source) {
     this._manager = manager;
 
-    const args = {
+    this._url = source.url;
+    this._fullRequestId = manager.request({
       onHeadersReceived: this._onHeadersReceived.bind(this),
       onDone: this._onDone.bind(this),
       onError: this._onError.bind(this),
       onProgress: this._onProgress.bind(this),
-    };
-    this._url = source.url;
-    this._fullRequestId = manager.requestFull(args);
+    });
     this._headersCapability = Promise.withResolvers();
     this._disableRange = source.disableRange || false;
     this._contentLength = source.length; // Optional
@@ -418,14 +402,15 @@ class PDFNetworkStreamRangeRequestReader {
   constructor(manager, begin, end) {
     this._manager = manager;
 
-    const args = {
+    this._url = manager.url;
+    this._requestId = manager.request({
+      begin,
+      end,
       onHeadersReceived: this._onHeadersReceived.bind(this),
       onDone: this._onDone.bind(this),
       onError: this._onError.bind(this),
       onProgress: this._onProgress.bind(this),
-    };
-    this._url = manager.url;
-    this._requestId = manager.requestRange(begin, end, args);
+    });
     this._requests = [];
     this._queuedChunk = null;
     this._done = false;