PlzNavigate: have renderer-initiated navigations be same-process

content/browser/frame_host/render_frame_host_manager.cc

Index: content/browser/frame_host/render_frame_host_manager.cc
diff --git a/content/browser/frame_host/render_frame_host_manager.cc b/content/browser/frame_host/render_frame_host_manager.cc
index b9328a40b2539c35bda23a47ff0299f2e67c4949..7fab96306c439b9d5dca4010475851f10fcec93d 100644
--- a/content/browser/frame_host/render_frame_host_manager.cc
+++ b/content/browser/frame_host/render_frame_host_manager.cc
@@ -720,9 +720,10 @@ RenderFrameHostImpl* RenderFrameHostManager::GetFrameHostForNavigation(
   // The appropriate RenderFrameHost to commit the navigation.
   RenderFrameHostImpl* navigation_rfh = nullptr;
 
-  // TODO(carlosk): do not swap processes for renderer initiated navigations
-  // (see crbug.com/440266).
+  // TODO(carlosk): Once there is support for cross-process scripting remove the
+  // check for renderer-initiated navigations. See crbug.com/440266.
   if (current_site_instance == dest_site_instance.get() ||
+      !request.browser_initiated() ||
       (!frame_tree_node_->IsMainFrame() &&
        !base::CommandLine::ForCurrentProcess()->HasSwitch(
            switches::kSitePerProcess))) {