Extract duplicated code in browser_tests for closing a browser.

chrome/test/base/in_process_browser_test.cc

Index: chrome/test/base/in_process_browser_test.cc
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index 2ee8c81231817fb77b3bafcb5c6bce35426edf8f..96f521b12bfb8a73f2b18e500d480eca98ad2eb3 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -19,6 +19,7 @@
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/net/net_error_tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
@@ -382,6 +383,32 @@ void InProcessBrowserTest::TearDown() {
   BrowserTestBase::TearDown();
 }
 
+void InProcessBrowserTest::CloseBrowserSynchronously(Browser* browser) {
+  content::WindowedNotificationObserver observer(
+      chrome::NOTIFICATION_BROWSER_CLOSED,
+      content::Source<Browser>(browser));
+  CloseBrowserAsynchronously(browser);
+  observer.Wait();
+}
+
+void InProcessBrowserTest::CloseBrowserAsynchronously(Browser* browser) {
+  browser->window()->Close();
+#if defined(OS_MACOSX)
+  // BrowserWindowController depends on the auto release pool being recycled
+  // in the message loop to delete itself.
+  AutoreleasePool()->Recycle();
+#endif
+}
+
+void InProcessBrowserTest::CloseAllBrowsers() {
+  chrome::CloseAllBrowsers();
+#if defined(OS_MACOSX)
+  // BrowserWindowController depends on the auto release pool being recycled
+  // in the message loop to delete itself.
+  AutoreleasePool()->Recycle();
+#endif
+}
+
 // TODO(alexmos): This function should expose success of the underlying
 // navigation to tests, which should make sure navigations succeed when
 // appropriate. See https://crbug.com/425335