Cleanup blink-side PlzNavigate logic

third_party/WebKit/Source/core/loader/ProgressTracker.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 86 matching lines @@
   m_lastNotifiedProgressValue = 0;
   m_lastNotifiedProgressTime = 0;
   m_finishedParsing = false;
 }
 
 LocalFrameClient* ProgressTracker::localFrameClient() const {
   return m_frame->client();
 }
 
 void ProgressTracker::progressStarted(FrameLoadType type) {
-  if (!m_frame->isLoading())
-    localFrameClient()->didStartLoading(NavigationToDifferentDocument);
   reset();
   m_progressValue = initialProgressValue;
-  m_frame->setIsLoading(true);
+  if (!m_frame->isLoading()) {
+    localFrameClient()->didStartLoading(NavigationToDifferentDocument);
+    m_frame->setIsLoading(true);
+  }
   probe::frameStartedLoading(m_frame, type);
 }
 
 void ProgressTracker::progressCompleted() {
   DCHECK(m_frame->isLoading());
   m_frame->setIsLoading(false);
   sendFinalProgress();
   reset();
   localFrameClient()->didStopLoading();
   probe::frameStoppedLoading(m_frame);
@@ skipping 111 matching lines @@
 void ProgressTracker::completeProgress(unsigned long identifier) {
   ProgressItem* item = m_progressItems.at(identifier);
   if (!item)
     return;
 
   item->estimatedLength = item->bytesReceived;
   maybeSendProgress();
 }
 
 }  // namespace blink