Remove use of getView() and replace with getViewByURL() where necessary. (#2544)

* WIP

* Replace getView with getViewByURL

src/main/app/initialize.test.js

@@ -153,6 +153,7 @@ jest.mock('main/windows/windowManager', () => ({
     sendToMattermostViews: jest.fn(),
     sendToRenderer: jest.fn(),
     getServerNameByWebContentsId: jest.fn(),
+    getServerURLFromWebContentsId: jest.fn(),
 }));
 describe('main/app/initialize', () => {
     beforeEach(() => {
@@ -237,6 +238,7 @@ describe('main/app/initialize', () => {
         });
 
         it('should allow permission requests for supported types from trusted URLs', async () => {
+            WindowManager.getServerURLFromWebContentsId.mockReturnValue(new URL('http://server-1.com'));
             let callback = jest.fn();
             session.defaultSession.setPermissionRequestHandler.mockImplementation((cb) => {
                 cb({id: 1, getURL: () => 'http://server-1.com'}, 'bad-permission', callback);