Remove unreleased web app frame code from ChromeOS

chrome/browser/ui/views/frame/browser_non_client_frame_view_mus.h

 // Copyright 2015 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 CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
 #include "chrome/browser/ui/views/tab_icon_view_model.h"
 #include "chrome/browser/ui/views/tabs/tab_strip_observer.h"
 
 #if !defined(OS_CHROMEOS)
 #include "chrome/browser/ui/views/frame/avatar_button_manager.h"
 #endif
 
 class TabIconView;
-class WebAppLeftHeaderView;
 
 namespace ui {
 class Window;
 }
 
 class BrowserNonClientFrameViewMus : public BrowserNonClientFrameView,
                                      public TabIconViewModel,
                                      public TabStripObserver {
  public:
   static const char kViewClassName[];
@@ skipping 59 matching lines @@
   // Returns true if we should use a super short header with light bars instead
   // of regular tabs. This header is used in immersive fullscreen when the
   // top-of-window views are not revealed.
   bool UseImmersiveLightbarHeaderStyle() const;
 
   // Returns true if the header should be painted so that it looks the same as
   // the header used for packaged apps. Packaged apps use a different color
   // scheme than browser windows.
   bool UsePackagedAppHeaderStyle() const;
 
-  // Returns true if the header should be painted with a WebApp header style.
-  // The WebApp header style has a back button and title along with the usual
-  // accoutrements.
-  bool UseWebAppHeaderStyle() const;
-
   // Layout the incognito button.
   void LayoutIncognitoButton();
 
   // Layout the profile switcher (if there is one).
   void LayoutProfileSwitcher();
 
   // Returns true if there is anything to paint. Some fullscreen windows do not
   // need their frames painted.
   bool ShouldPaint() const;
 
@@ skipping 16 matching lines @@
   // Wrapper around the in-frame avatar switcher.
   AvatarButtonManager profile_switcher_;
 #endif
 
   TabStrip* tab_strip_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserNonClientFrameViewMus);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_MUS_H_