Extract duplicated code in browser_tests for closing a browser.

chrome/browser/sessions/session_restore_browsertest.cc

Index: chrome/browser/sessions/session_restore_browsertest.cc
diff --git a/chrome/browser/sessions/session_restore_browsertest.cc b/chrome/browser/sessions/session_restore_browsertest.cc
index 8f32f87d2ddb9cf90892b1c51ab35ebf098ab399..fd51d08fd35d937a340d98ffcaaa8835806da973 100644
--- a/chrome/browser/sessions/session_restore_browsertest.cc
+++ b/chrome/browser/sessions/session_restore_browsertest.cc
@@ -11,7 +11,6 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/profiles/profile.h"
@@ -109,20 +108,6 @@ class SessionRestoreTest : public InProcessBrowserTest {
     return InProcessBrowserTest::SetUpUserDataDirectory();
   }
 
-  void CloseBrowserSynchronously(Browser* browser) {
-    content::WindowedNotificationObserver observer(
-        chrome::NOTIFICATION_BROWSER_CLOSED,
-        content::NotificationService::AllSources());
-    browser->window()->Close();
-#if defined(OS_MACOSX)
-    // BrowserWindowController depends on the auto release pool being recycled
-    // in the message loop to delete itself, which frees the Browser object
-    // which fires this event.
-    AutoreleasePool()->Recycle();
-#endif
-    observer.Wait();
-  }
-
   Browser* QuitBrowserAndRestore(Browser* browser, int expected_tab_count) {
     return QuitBrowserAndRestoreWithURL(
         browser, expected_tab_count, GURL(), true);