Remove all blimp client code.

blimp/client/core/contents/blimp_navigation_controller_delegate.h

-// Copyright 2016 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 BLIMP_CLIENT_CORE_CONTENTS_BLIMP_NAVIGATION_CONTROLLER_DELEGATE_H_
-#define BLIMP_CLIENT_CORE_CONTENTS_BLIMP_NAVIGATION_CONTROLLER_DELEGATE_H_
-
-#include "base/macros.h"
-#include "url/gurl.h"
-
-namespace blimp {
-namespace client {
-
-// Interface for objects embedding a BlimpNavigationControllerImpl to provide
-// the functionality BlimpNavigationControllerImpl needs.
-class BlimpNavigationControllerDelegate {
- public:
-  virtual ~BlimpNavigationControllerDelegate() = default;
-
-  // TODO(dtrainor): Pull apart this method into more fine grained notifications
-  // or add an enum to detect exactly which state changed.
-  // Informs the delegate that navigation state has changed.
-  virtual void OnNavigationStateChanged() = 0;
-
-  // Informs the delegate that navigation loading has started or stopped.
-  virtual void OnLoadingStateChanged(bool loading) = 0;
-
-  // Informs the delegate that page loading has started or stopped.
-  virtual void OnPageLoadingStateChanged(bool loading) = 0;
-
- protected:
-  BlimpNavigationControllerDelegate() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(BlimpNavigationControllerDelegate);
-};
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_CORE_CONTENTS_BLIMP_NAVIGATION_CONTROLLER_DELEGATE_H_