Revert of App button click exits WebVR presentation.

chrome/browser/android/vr_shell/vr_browser_interface.h

Index: chrome/browser/android/vr_shell/vr_browser_interface.h
diff --git a/chrome/browser/android/vr_shell/vr_browser_interface.h b/chrome/browser/android/vr_shell/vr_browser_interface.h
index 6774ad2da92124d022c3535832512e8daee178bf..da52b4cff4db56afb4e4d7b8601365c9f2300472 100644
--- a/chrome/browser/android/vr_shell/vr_browser_interface.h
+++ b/chrome/browser/android/vr_shell/vr_browser_interface.h
@@ -25,7 +25,7 @@
 // interface are proxies to methods on VrShell.
 class VrBrowserInterface {
  public:
-  virtual ~VrBrowserInterface() = default;
+  virtual ~VrBrowserInterface() {}
 
   virtual void ContentSurfaceChanged(jobject surface) = 0;
   virtual void GvrDelegateReady() = 0;
@@ -35,7 +35,6 @@
   virtual void ProcessContentGesture(
       std::unique_ptr<blink::WebInputEvent> event) = 0;
   virtual void ForceExitVr() = 0;
-  virtual void ExitPresent() = 0;
   virtual void RunVRDisplayInfoCallback(
       const base::Callback<void(device::mojom::VRDisplayInfoPtr)>& callback,
       device::mojom::VRDisplayInfoPtr* info) = 0;