fix(server_manager): replace turned down omahaproxy.appspot.com

src/server_manager/electron_and_karma_chromium.spec.ts

@@ -22,16 +22,16 @@ import {config} from './package.json';
 
 describe('Karma', () => {
   it('uses the correct Chromium version', async (done) => {
-    // Omaha Proxy is a service maintained by the Chrome team which serves metadata about current
-    // and legacy Chrome versions.
     const electronChromiumVersionInfo = <{chromium_base_position?: string}>(
       await (
         await fetch(
-          `http://omahaproxy.appspot.com/deps.json?version=${electronToChromium(electronVersion)}`
+          `https://chromiumdash.appspot.com/fetch_version?version=${electronToChromium(
+            electronVersion
+          )}`
         )
       ).json()
     );
-    const electronChromeRevision = electronChromiumVersionInfo.chromium_base_position;
+    const electronChromeRevision = electronChromiumVersionInfo.chromium_main_branch_position;
     expect(electronChromeRevision).toEqual(config.PUPPETEER_CHROMIUM_REVISION);
     done();
   });