Remove obsolete cruft in LazyBackgroundTaskQueue that dealt with queueing up

chrome/browser/extensions/lazy_background_task_queue.h

Index: chrome/browser/extensions/lazy_background_task_queue.h
diff --git a/chrome/browser/extensions/lazy_background_task_queue.h b/chrome/browser/extensions/lazy_background_task_queue.h
index 55980b76b838a96ae07360e151cce06477ee3694..dd612185217cafc41cf7a2c17376106c91df16cf 100644
--- a/chrome/browser/extensions/lazy_background_task_queue.h
+++ b/chrome/browser/extensions/lazy_background_task_queue.h
@@ -6,13 +6,11 @@
 #define CHROME_BROWSER_EXTENSIONS_LAZY_BACKGROUND_TASK_QUEUE_H_
 
 #include <map>
-#include <set>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/callback_forward.h"
 #include "base/memory/linked_ptr.h"
-#include "base/memory/weak_ptr.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
@@ -28,9 +26,7 @@ class ExtensionHost;
 //
 // It is the consumer's responsibility to use this class when appropriate, i.e.
 // only with extensions that have not-yet-loaded lazy background pages.
-class LazyBackgroundTaskQueue
-    : public content::NotificationObserver,
-      public base::SupportsWeakPtr<LazyBackgroundTaskQueue> {
+class LazyBackgroundTaskQueue : public content::NotificationObserver {
  public:
   typedef base::Callback<void(ExtensionHost*)> PendingTask;
 
@@ -61,10 +57,6 @@ class LazyBackgroundTaskQueue
   typedef std::vector<PendingTask> PendingTasksList;
   typedef std::map<PendingTasksKey,
                    linked_ptr<PendingTasksList> > PendingTasksMap;
-  typedef std::set<PendingTasksKey> PendingPageLoadList;
-
-  void StartLazyBackgroundPage(Profile* profile,
-                               const std::string& extension_id);
 
   // content::NotificationObserver interface.
   virtual void Observe(int type,
@@ -81,7 +73,6 @@ class LazyBackgroundTaskQueue
   Profile* profile_;
   content::NotificationRegistrar registrar_;
   PendingTasksMap pending_tasks_;
-  PendingPageLoadList pending_page_loads_;
 };
 
 }  // namespace extensions