Avoid deprecated ipcRenderer.sendTo.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

app/renderer/js/components/webview.ts

@@ -226,7 +226,7 @@ export default class WebView {
     channel: Channel,
     ...args: Parameters<RendererMessage[Channel]>
   ): void {
-    ipcRenderer.sendTo(this.webContentsId, channel, ...args);
+    ipcRenderer.send("forward-to", this.webContentsId, channel, ...args);
   }
 
   private registerListeners(): void {

app/renderer/js/pages/preference/general-section.ts

@@ -356,7 +356,8 @@ export function initGeneralSection({$root}: GeneralSectionProps): void {
         const newValue = !ConfigUtil.getConfigItem("silent", true);
         ConfigUtil.setConfigItem("silent", newValue);
         updateSilentOption();
-        ipcRenderer.sendTo(
+        ipcRenderer.send(
+          "forward-to",
           currentBrowserWindow.webContents.id,
           "toggle-silent",
           newValue,

app/renderer/js/tray.ts

@@ -138,7 +138,7 @@ function sendAction<Channel extends keyof RendererMessage>(
     win.restore();
   }
 
-  ipcRenderer.sendTo(win.webContents.id, channel, ...args);
+  ipcRenderer.send("forward-to", win.webContents.id, channel, ...args);
 }
 
 const createTray = function (): void {

app/renderer/js/typed-ipc-renderer.ts

@@ -37,6 +37,12 @@ export const ipcRenderer: {
     rendererChannel: Channel,
     ...args: Parameters<RendererMessage[Channel]>
   ): void;
+  send<Channel extends keyof RendererMessage>(
+    channel: "forward-to",
+    webContentsId: number,
+    rendererChannel: Channel,
+    ...args: Parameters<RendererMessage[Channel]>
+  ): void;
   send<Channel extends keyof MainMessage>(
     channel: Channel,
     ...args: Parameters<MainMessage[Channel]>
@@ -56,11 +62,6 @@ export const ipcRenderer: {
       : never,
     transfer?: MessagePort[],
   ): void;
-  sendTo<Channel extends keyof RendererMessage>(
-    webContentsId: number,
-    channel: Channel,
-    ...args: Parameters<RendererMessage[Channel]>
-  ): void;
   sendToHost<Channel extends keyof RendererMessage>(
     channel: Channel,
     ...args: Parameters<RendererMessage[Channel]>