Revert of Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480

mojo/services/public/cpp/view_manager/view_tracker.h

Index: mojo/services/public/cpp/view_manager/view_tracker.h
diff --git a/mojo/services/public/cpp/view_manager/view_tracker.h b/mojo/services/public/cpp/view_manager/view_tracker.h
deleted file mode 100644
index 71a218a94df6647507f120aa4ae9b4532462b840..0000000000000000000000000000000000000000
--- a/mojo/services/public/cpp/view_manager/view_tracker.h
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_
-#define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_
-
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "mojo/services/public/cpp/view_manager/view_observer.h"
-
-namespace mojo {
-
-class ViewTracker : public ViewObserver {
- public:
-  using Views = std::set<View*>;
-
-  ViewTracker();
-  ~ViewTracker() override;
-
-  // Returns the set of views being observed.
-  const std::set<View*>& views() const { return views_; }
-
-  // Adds |view| to the set of Views being tracked.
-  void Add(View* view);
-
-  // Removes |view| from the set of views being tracked.
-  void Remove(View* view);
-
-  // Returns true if |view| was previously added and has not been removed or
-  // deleted.
-  bool Contains(View* view);
-
-  // ViewObserver overrides:
-  virtual void OnViewDestroying(View* view) override;
-
- private:
-  Views views_;
-
-  DISALLOW_COPY_AND_ASSIGN(ViewTracker);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_