VR: Use ToolbarModel to drive VR URL bar state.

chrome/browser/android/vr_shell/vr_web_contents_observer.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_WEB_CONTENTS_OBSERVER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class NavigationHandle;
 }
 
 namespace vr_shell {
 
 class UiInterface;
 class VrShell;
+class ToolbarHelper;
 
 class CONTENT_EXPORT VrWebContentsObserver
     : public content::WebContentsObserver {
  public:
   VrWebContentsObserver(content::WebContents* web_contents,
+                        VrShell* vr_shell,
                         UiInterface* ui_interface,
-                        VrShell* vr_shell);
+                        ToolbarHelper* toolbar);
   ~VrWebContentsObserver() override;
 
   void SetUiInterface(UiInterface* ui_interface);
 
  private:
   // WebContentsObserver implementation.
   void DidStartLoading() override;
   void DidStopLoading() override;
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidRedirectNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
   void DidToggleFullscreenModeForTab(bool entered_fullscreen,
                                      bool will_cause_resize) override;
   void DidChangeVisibleSecurityState() override;
   void WebContentsDestroyed() override;
   void WasHidden() override;
   void WasShown() override;
   void MainFrameWasResized(bool width_changed) override;
   void RenderViewHostChanged(content::RenderViewHost* old_host,
                              content::RenderViewHost* new_host) override;
 
-  // This class does not own the UI interface.
+  // This class does not own these pointers.
+  VrShell* vr_shell_;
   UiInterface* ui_interface_;
-  VrShell* vr_shell_;
+  ToolbarHelper* toolbar_;
 
   DISALLOW_COPY_AND_ASSIGN(VrWebContentsObserver);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_WEB_CONTENTS_OBSERVER_H_