Revert of Re-land WebVR compositor bypass via BrowserMain context + mailbox

chrome/browser/android/vr_shell/vr_shell_delegate.h

Index: chrome/browser/android/vr_shell/vr_shell_delegate.h
diff --git a/chrome/browser/android/vr_shell/vr_shell_delegate.h b/chrome/browser/android/vr_shell/vr_shell_delegate.h
index 539c3cde4e6f6108edcbb3bab5847f1f96c68170..3b5161db11a4a526b78401644b5201af9c311902 100644
--- a/chrome/browser/android/vr_shell/vr_shell_delegate.h
+++ b/chrome/browser/android/vr_shell/vr_shell_delegate.h
@@ -49,17 +49,16 @@
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void ShowTab(int id);
   void OpenNewTab(bool incognito);
-  device::mojom::VRSubmitFrameClientPtr TakeSubmitFrameClient();
 
   device::GvrDeviceProvider* device_provider() { return device_provider_; }
+  void OnVRVsyncProviderRequest(device::mojom::VRVSyncProviderRequest request);
   base::WeakPtr<VrShellDelegate> GetWeakPtr();
 
  private:
   // device::GvrDelegateProvider implementation
   void SetDeviceProvider(device::GvrDeviceProvider* device_provider) override;
   void ClearDeviceProvider() override;
-  void RequestWebVRPresent(device::mojom::VRSubmitFrameClientPtr submit_client,
-                           const base::Callback<void(bool)>& callback) override;
+  void RequestWebVRPresent(const base::Callback<void(bool)>& callback) override;
   void ExitWebVRPresent() override;
   device::GvrDelegate* GetDelegate() override;
   void SetListeningForActivate(bool listening) override;
@@ -73,7 +72,10 @@
   base::Callback<void(bool)> present_callback_;
   int64_t timebase_nanos_ = 0;
   double interval_seconds_ = 0;
-  device::mojom::VRSubmitFrameClientPtr submit_client_;
+
+  // TODO(mthiesse): Remove the need for this to be stored here.
+  // crbug.com/674594
+  gvr_context* context_ = nullptr;
 
   base::WeakPtrFactory<VrShellDelegate> weak_ptr_factory_;