PlzNavigate: implement RequestNavigation in the no live renderer case

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index c9125d892d9ed031a150235e0f7d944e8720815a..f806156bb8a4f534a5459e1d4d8735e2ee4e9e54 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -5,6 +5,7 @@
 #include "content/browser/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/user_metrics_action.h"
@@ -44,6 +45,7 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_constants.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/common/url_utils.h"
 #include "ui/accessibility/ax_tree.h"
@@ -904,9 +906,9 @@ void RenderFrameHostImpl::OnUpdateEncoding(const std::string& encoding_name) {
 
 void RenderFrameHostImpl::OnBeginNavigation(
     const FrameHostMsg_BeginNavigation_Params& params) {
-#if defined(USE_BROWSER_SIDE_NAVIGATION)
-  frame_tree_node()->render_manager()->OnBeginNavigation(params);
-#endif
+  CHECK(CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableBrowserSideNavigation));
+  frame_tree_node()->navigator()->OnBeginNavigation(this, params);
 }
 
 void RenderFrameHostImpl::OnAccessibilityEvents(