refactor: rename the atom directory to shell

shell/browser/ui/cocoa/root_view_mac.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2018 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_UI_COCOA_ROOT_VIEW_MAC_H_
+#define ATOM_BROWSER_UI_COCOA_ROOT_VIEW_MAC_H_
+
+#include "ui/views/view.h"
+
+namespace atom {
+
+class NativeWindow;
+
+class RootViewMac : public views::View {
+ public:
+  explicit RootViewMac(NativeWindow* window);
+  ~RootViewMac() override;
+
+  // views::View:
+  void Layout() override;
+  gfx::Size GetMinimumSize() const override;
+  gfx::Size GetMaximumSize() const override;
+
+ private:
+  // Parent window, weak ref.
+  NativeWindow* window_;
+
+  DISALLOW_COPY_AND_ASSIGN(RootViewMac);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_UI_COCOA_ROOT_VIEW_MAC_H_