[Extensions] Remove ExtensionFunction usage of RenderViewHost

extensions/browser/extension_function.cc

Index: extensions/browser/extension_function.cc
diff --git a/extensions/browser/extension_function.cc b/extensions/browser/extension_function.cc
index 255f2c63abaf35e497bae1096df7a8b1ba038b95..1408071f21cd9f36e6330a2d04ac4a74ac1a2c11 100644
--- a/extensions/browser/extension_function.cc
+++ b/extensions/browser/extension_function.cc
@@ -518,11 +518,6 @@ void UIThreadExtensionFunction::Destruct() const {
   BrowserThread::DeleteOnUIThread::Destruct(this);
 }
 
-content::RenderViewHost*
-UIThreadExtensionFunction::render_view_host_do_not_use() const {
-  return render_frame_host_ ? render_frame_host_->GetRenderViewHost() : nullptr;
-}
-
 void UIThreadExtensionFunction::SetRenderFrameHost(
     content::RenderFrameHost* render_frame_host) {
   // An extension function from Service Worker does not have a RenderFrameHost.