Tab switcher theme colors no longer behind flag

chrome/browser/android/compositor/layer/tab_layer.h

 // 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 CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 104 matching lines @@
            TabContentManager* tab_content_manager);
   ~TabLayer() override;
 
  private:
   void SetTitle(DecorationTitle* title);
   std::unique_ptr<cc::FilterOperations> createSolidColorFilter(int color);
 
   const bool incognito_;
   bool toolbar_background_color_;
   bool close_button_color_;
-  bool tab_switcher_themes_enabled_;
   ui::ResourceManager* resource_manager_;
   LayerTitleCache* layer_title_cache_;
 
   // [layer]-+-[toolbar]
   //         +-[close button]
   //         +-[title]
   //         +-[front border]
   //         +-[content]
   //         +-[back_logo]
   //         +-[padding]
@@ skipping 15 matching lines @@
   scoped_refptr<cc::UIResourceLayer> back_logo_;
   float brightness_;
 
   DISALLOW_COPY_AND_ASSIGN(TabLayer);
 };
 
 }  //  namespace android
 }  //  namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_TAB_LAYER_H_