Remove invalid check

extensions/browser/app_window/app_window.cc

Index: extensions/browser/app_window/app_window.cc
diff --git a/extensions/browser/app_window/app_window.cc b/extensions/browser/app_window/app_window.cc
index 67c5019fed46c095e8be287eeb014e22f6758626..c6f3fe75fdf7b0987db640db2a661eaefd849a13 100644
--- a/extensions/browser/app_window/app_window.cc
+++ b/extensions/browser/app_window/app_window.cc
@@ -484,7 +484,14 @@ void AppWindow::SetOnFirstCommitCallback(const base::Closure& callback) {
 }
 
 void AppWindow::OnReadyToCommitFirstNavigation() {
-  CHECK(content::IsBrowserSideNavigationEnabled());
+  if (!content::IsBrowserSideNavigationEnabled())
+    return;
+
+  // PlzNavigate: execute renderer-side setup now that there is a renderer
+  // process assigned to the navigation. In the current architecture, this would

[Devlin, 2016/11/17 15:51:19]

optional nit: phrasing like "current architecture" is sometimes asking to become
obsolete :)  Can we describe this as "With renderer-side navigation", or
similar?

[clamy, 2016/11/21 16:05:09]

Done.

+  // happen before the navigation starts, but PlzNavigate must wait until this
+  // point in time in the navigation.
+
   WindowEventsReady();
   if (on_first_commit_callback_.is_null())
     return;