[MM-34067] Explicitly destroy web contents in non-permanent BrowserViews (#1519)

* [MM-34067] Explicitly destroy web contents in non-permanent BrowserViews

* Comment to remove this later

src/main/views/MattermostView.js

@@ -171,6 +171,11 @@ export class MattermostView extends EventEmitter {
         if (this.window) {
             this.window.removeBrowserView(this.view);
         }
+
+        // workaround to eliminate zombie processes
+        // https://github.com/mattermost/desktop/pull/1519
+        this.view.webContents.destroy();
+
         this.window = null;
         this.server = null;
         this.isVisible = false;

src/main/views/modalView.js

@@ -70,8 +70,12 @@ export class ModalView {
             if (this.view.webContents.isDevToolsOpened()) {
                 this.view.webContents.closeDevTools();
             }
-
             this.windowAttached.removeBrowserView(this.view);
+
+            // workaround to eliminate zombie processes
+            // https://github.com/mattermost/desktop/pull/1519
+            this.view.webContents.destroy();
+
             this.windowAttached = null;
             this.status = ACTIVE;
         }

src/main/views/viewManager.js

@@ -203,6 +203,10 @@ export class ViewManager {
             const hideView = () => {
                 this.urlViewCancel = null;
                 currentWindow.removeBrowserView(urlView);
+
+                // workaround to eliminate zombie processes
+                // https://github.com/mattermost/desktop/pull/1519
+                urlView.webContents.destroy();
             };
 
             const timeout = setTimeout(hideView,