Remove ENABLE_VR_SHELL compile-time define.

chrome/browser/android/vr_shell/vr_shell.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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_
 
 #include <jni.h>
 
 #include <memory>
@@ skipping 165 matching lines @@
   void UpdateVSyncInterval(long timebase_nanos,
                            double interval_seconds) override;
   bool SupportsPresentation() override;
   void ResetPose() override;
   void CreateVRDisplayInfo(
       const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
       uint32_t device_id) override;
 
   void ProcessTabArray(JNIEnv* env, jobjectArray tabs, bool incognito);
 
+  bool feature_enabled_;
+
   std::unique_ptr<UiInterface> html_interface_;
   bool content_paused_ = false;
   bool webvr_mode_ = false;
 
   content::WebContents* main_contents_;
   std::unique_ptr<VrCompositor> content_compositor_;
   content::WebContents* ui_contents_;
   std::unique_ptr<VrCompositor> ui_compositor_;
 
   std::unique_ptr<VrWebContentsObserver> vr_web_contents_observer_;
@@ skipping 16 matching lines @@
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VrShell);
 };
 
 bool RegisterVrShell(JNIEnv* env);
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_SHELL_H_