PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

components/contextual_search/renderer/overlay_js_render_frame_observer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/contextual_search/renderer/overlay_js_render_frame_observer.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "components/contextual_search/renderer/contextual_search_wrapper.h"
 #include "components/contextual_search/renderer/overlay_page_notifier_service_impl.h"
 #include "content/public/renderer/render_frame.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "v8/include/v8.h"
 
 namespace contextual_search {
 
 OverlayJsRenderFrameObserver::OverlayJsRenderFrameObserver(
     content::RenderFrame* render_frame)
     : RenderFrameObserver(render_frame),
       is_contextual_search_overlay_(false),
       weak_factory_(this) {}
 
 OverlayJsRenderFrameObserver::~OverlayJsRenderFrameObserver() {}
 
-void OverlayJsRenderFrameObserver::DidStartProvisionalLoad() {
+void OverlayJsRenderFrameObserver::DidStartProvisionalLoad(
+    blink::WebDataSource* data_source) {
   RegisterMojoInterface();
 }
 
 void OverlayJsRenderFrameObserver::RegisterMojoInterface() {
   render_frame()->GetInterfaceRegistry()->AddInterface(base::Bind(
       &OverlayJsRenderFrameObserver::CreateOverlayPageNotifierService,
       weak_factory_.GetWeakPtr()));
 }
 
 void OverlayJsRenderFrameObserver::CreateOverlayPageNotifierService(
@@ skipping 28 matching lines @@
         ->RemoveInterface<mojom::OverlayPageNotifierService>();
   }
 }
 
 void OverlayJsRenderFrameObserver::OnDestruct() {
   DestroyOverlayPageNotifierService();
   delete this;
 }
 
 }  // namespace contextual_search