fix: do not wait on promise returned by remote APIs (#18990)

* fix: make <webview>.loadURL async

* docs: webview.loadURL returns Promise

lib/common/web-view-methods.js

@@ -3,7 +3,6 @@
 // Public-facing API methods.
 exports.syncMethods = new Set([
   'getURL',
-  'loadURL',
   'getTitle',
   'isLoading',
   'isLoadingMainFrame',
@@ -54,6 +53,7 @@ exports.syncMethods = new Set([
 ])
 
 exports.asyncMethods = new Set([
+  'loadURL',
   'capturePage',
   'executeJavaScript',
   'insertCSS',

lib/renderer/web-view/web-view-attributes.ts

@@ -196,7 +196,7 @@ class SrcAttribute extends WebViewAttribute {
     const method = 'loadURL'
     const args = [this.getValue(), opts]
 
-    ipcRendererUtils.invokeSync('ELECTRON_GUEST_VIEW_MANAGER_CALL', guestInstanceId, method, args)
+    ipcRendererUtils.invoke('ELECTRON_GUEST_VIEW_MANAGER_CALL', guestInstanceId, method, args)
   }
 }