Revert of Revert "Revert of Reland: Switch WindowedNotificationObserver to use base::RunLoop.

chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc

Index: chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
diff --git a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
index e4eac62b09b5bd104364ce2af512b13b1bd80b7c..c9da53c5eda3a27eb2509e9c04614f41ecefea17 100644
--- a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
+++ b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
@@ -525,21 +525,21 @@
 class WindowDestroyer : public content::WebContentsObserver {
  public:
   WindowDestroyer(content::WebContents* web_contents, TabStripModel* model)
-      : content::WebContentsObserver(web_contents),
-        tab_strip_model_(model),
-        browser_closed_observer_(chrome::NOTIFICATION_BROWSER_CLOSED,
-                                 content::NotificationService::AllSources()) {}
-
-  // Wait for the browser window to be destroyed.
-  void Wait() { browser_closed_observer_.Wait(); }
+      : content::WebContentsObserver(web_contents), tab_strip_model_(model) {}
 
   void RenderProcessGone(base::TerminationStatus status) override {
+    // Wait for the window to be destroyed, which will ensure all other
+    // RenderViewHost objects are deleted before we return and proceed with
+    // the next iteration of notifications.
+    content::WindowedNotificationObserver observer(
+        chrome::NOTIFICATION_BROWSER_CLOSED,
+        content::NotificationService::AllSources());
     tab_strip_model_->CloseAllTabs();
+    observer.Wait();
   }
 
  private:
   TabStripModel* tab_strip_model_;
-  content::WindowedNotificationObserver browser_closed_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowDestroyer);
 };
@@ -572,12 +572,16 @@
   // Create an object that will close the window on a process crash.
   WindowDestroyer destroyer(wc1, browser()->tab_strip_model());
 
+  content::WindowedNotificationObserver observer(
+      chrome::NOTIFICATION_BROWSER_CLOSED,
+      content::NotificationService::AllSources());
+
   // Kill the renderer process, simulating a crash. This should the ProcessDied
   // method to be called. Alternatively, RenderProcessHost::OnChannelError can
   // be called to directly force a call to ProcessDied.
   wc1->GetRenderProcessHost()->Shutdown(-1, true);
 
-  destroyer.Wait();
+  observer.Wait();
 }
 
 // Sets up the browser in order to start the tests with two tabs open: one