Remove the web-ui task manager unused stuffs for non-ChromeOS.

chrome/browser/ui/cocoa/browser_window_cocoa.mm

Index: chrome/browser/ui/cocoa/browser_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_cocoa.mm b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
index ec84653cd1cc0f916247dd1f2ef897d77dd224b3..f0595e50f6c3afafcc85e23b94770649d0872c0b 100644
--- a/chrome/browser/ui/cocoa/browser_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/browser_window_cocoa.mm
@@ -35,7 +35,6 @@
 #import "chrome/browser/ui/cocoa/toolbar/toolbar_controller.h"
 #include "chrome/browser/ui/page_info_bubble.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
-#include "chrome/browser/ui/webui/task_manager/task_manager_dialog.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/notification_source.h"
@@ -416,29 +415,11 @@ void BrowserWindowCocoa::ShowUpdateChromeDialog() {
 }
 
 void BrowserWindowCocoa::ShowTaskManager() {
-#if defined(WEBUI_TASK_MANAGER)
-  TaskManagerDialog::Show();
-#else
-  // Uses WebUI TaskManager when swiches is set. It is beta feature.
-  if (TaskManagerDialog::UseWebUITaskManager()) {
-    TaskManagerDialog::Show();
-  } else {
-    TaskManagerMac::Show(false);
-  }
-#endif  // defined(WEBUI_TASK_MANAGER)
+  TaskManagerMac::Show(false);
 }
 
 void BrowserWindowCocoa::ShowBackgroundPages() {
-#if defined(WEBUI_TASK_MANAGER)
-  TaskManagerDialog::ShowBackgroundPages();
-#else
-  // Uses WebUI TaskManager when swiches is set. It is beta feature.
-  if (TaskManagerDialog::UseWebUITaskManager()) {
-    TaskManagerDialog::ShowBackgroundPages();
-  } else {
-    TaskManagerMac::Show(true);
-  }
-#endif  // defined(WEBUI_TASK_MANAGER)
+  TaskManagerMac::Show(true);
 }
 
 void BrowserWindowCocoa::ShowBookmarkBubble(const GURL& url,