Fix the segfault on Linux when closing a tab that is in tab fullscreen mode.

chrome/browser/ui/browser_browsertest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
@@ skipping 859 matching lines @@
   {
     ui_test_utils::WindowedNotificationObserver fullscreen_observer(
         chrome::NOTIFICATION_FULLSCREEN_CHANGED,
         content::NotificationService::AllSources());
     browser()->ToggleFullscreenModeForTab(fullscreen_tab, false);
     fullscreen_observer.Wait();
     ASSERT_FALSE(browser()->window()->IsFullscreen());
   }
 }
 
-#if defined(OS_LINUX)
-// http://crbug.com/100680.
-#define MAYBE_TestFullscreenBubbleMouseLockState \
-        DISABLED_TestFullscreenBubbleMouseLockState
-#else
-#define MAYBE_TestFullscreenBubbleMouseLockState \
-        TestFullscreenBubbleMouseLockState
-#endif
-
-IN_PROC_BROWSER_TEST_F(BrowserTest, MAYBE_TestFullscreenBubbleMouseLockState) {
+IN_PROC_BROWSER_TEST_F(BrowserTest, TestFullscreenBubbleMouseLockState) {
   ASSERT_TRUE(test_server()->Start());
 
   AddTabAtIndex(0, GURL(chrome::kAboutBlankURL),
                 content::PAGE_TRANSITION_TYPED);
+  AddTabAtIndex(1, GURL(chrome::kAboutBlankURL),
+                content::PAGE_TRANSITION_TYPED);
 
   TabContents* fullscreen_tab = browser()->GetSelectedTabContents();
 
   {
     ui_test_utils::WindowedNotificationObserver fullscreen_observer(
         chrome::NOTIFICATION_FULLSCREEN_CHANGED,
         content::NotificationService::AllSources());
     browser()->ToggleFullscreenModeForTab(fullscreen_tab, true);
     fullscreen_observer.Wait();
     ASSERT_TRUE(browser()->window()->IsFullscreen());
@@ skipping 330 matching lines @@
 
   // The normal browser should now have four.
   EXPECT_EQ(4, browser()->tab_count());
 
   // Close the additional browsers.
   popup_browser->CloseAllTabs();
   app_browser->CloseAllTabs();
   app_popup_browser->CloseAllTabs();
 }
 #endif