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

components/printing/renderer/print_web_view_helper.h

 // Copyright (c) 2012 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.
 
 #ifndef COMPONENTS_PRINTING_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 #define COMPONENTS_PRINTING_RENDERER_PRINT_WEB_VIEW_HELPER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 153 matching lines @@
 
   enum PrintPreviewRequestType {
     PRINT_PREVIEW_USER_INITIATED_ENTIRE_FRAME,
     PRINT_PREVIEW_USER_INITIATED_SELECTION,
     PRINT_PREVIEW_USER_INITIATED_CONTEXT_NODE,
     PRINT_PREVIEW_SCRIPTED  // triggered by window.print().
   };
 
   // RenderFrameObserver implementation.
   void OnDestruct() override;
-  void DidStartProvisionalLoad() override;
+  void DidStartProvisionalLoad(blink::WebDataSource* data_source) override;
   void DidFailProvisionalLoad(const blink::WebURLError& error) override;
   void DidFinishLoad() override;
   void ScriptedPrint(bool user_initiated) override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // Message handlers ---------------------------------------------------------
 #if BUILDFLAG(ENABLE_BASIC_PRINTING)
   void OnPrintPages();
   void OnPrintForSystemDialog();
   void OnPrintForPrintPreview(const base::DictionaryValue& job_settings);
@@ skipping 354 matching lines @@
   base::Closure on_stop_loading_closure_;
 
   base::WeakPtrFactory<PrintWebViewHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintWebViewHelper);
 };
 
 }  // namespace printing
 
 #endif  // COMPONENTS_PRINTING_RENDERER_PRINT_WEB_VIEW_HELPER_H_