Introduce the ThrottleManager

content/public/test/navigation_simulator.cc

Index: content/public/test/navigation_simulator.cc
diff --git a/content/public/test/navigation_simulator.cc b/content/public/test/navigation_simulator.cc
index 81b1afa8d2fd50b4f7b6922829b8f72b3eef6c5f..015dd4c22a673d7b4951607bed6ff9059c485dfa 100644
--- a/content/public/test/navigation_simulator.cc
+++ b/content/public/test/navigation_simulator.cc
@@ -354,8 +354,8 @@ void NavigationSimulator::Fail(int error_code) {
   }
 
   if (IsBrowserSideNavigationEnabled()) {
-    CHECK_EQ(1, num_ready_to_commit_called_);
     if (should_result_in_error_page) {
+      CHECK_EQ(1, num_ready_to_commit_called_);
       // Update the RenderFrameHost now that we know which RenderFrameHost will
       // commit the error page.
       render_frame_host_ =
@@ -560,4 +560,9 @@ void NavigationSimulator::PrepareCompleteCallbackOnHandle() {
                  weak_factory_.GetWeakPtr()));
 }
 
+RenderFrameHost* NavigationSimulator::GetFinalRenderFrameHost() {
+  CHECK_EQ(state_, FINISHED);
+  return render_frame_host_;
+}
+
 }  // namespace content