Use LocalFrame::client() than getting the FrameLoader and then call client() on it.

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 81 matching lines @@
 }
 
 void ProgressTracker::reset() {
   m_progressItems.clear();
   m_progressValue = 0;
   m_lastNotifiedProgressValue = 0;
   m_lastNotifiedProgressTime = 0;
   m_finishedParsing = false;
 }
 
+FrameLoaderClient* ProgressTracker::frameLoaderClient() const {
+  return m_frame->client();
+}
+
 void ProgressTracker::progressStarted() {
   if (!m_frame->isLoading())
-    m_frame->loader().client()->didStartLoading(NavigationToDifferentDocument);
+    frameLoaderClient()->didStartLoading(NavigationToDifferentDocument);
   reset();
   m_progressValue = initialProgressValue;
   m_frame->setIsLoading(true);
   InspectorInstrumentation::frameStartedLoading(m_frame);
 }
 
 void ProgressTracker::progressCompleted() {
   DCHECK(m_frame->isLoading());
   m_frame->setIsLoading(false);
   sendFinalProgress();
   reset();
-  m_frame->loader().client()->didStopLoading();
+  frameLoaderClient()->didStopLoading();
   InspectorInstrumentation::frameStoppedLoading(m_frame);
 }
 
 void ProgressTracker::finishedParsing() {
   m_finishedParsing = true;
   maybeSendProgress();
 }
 
 void ProgressTracker::sendFinalProgress() {
   if (m_progressValue == 1)
     return;
   m_progressValue = 1;
-  m_frame->loader().client()->progressEstimateChanged(m_progressValue);
+  frameLoaderClient()->progressEstimateChanged(m_progressValue);
 }
 
 void ProgressTracker::willStartLoading(unsigned long identifier,
                                        ResourceLoadPriority priority) {
   if (!m_frame->isLoading())
     return;
   // All of the progress bar completion policies besides LoadEvent instead block
   // on parsing completion, which corresponds to finishing parsing. For those
   // policies, don't consider resource load that start after DOMContentLoaded
   // finishes.
@@ skipping 73 matching lines @@
   if (m_progressValue < m_lastNotifiedProgressValue)
     return;
 
   double now = currentTime();
   double notifiedProgressTimeDelta = now - m_lastNotifiedProgressTime;
 
   double notificationProgressDelta =
       m_progressValue - m_lastNotifiedProgressValue;
   if (notificationProgressDelta >= progressNotificationInterval ||
       notifiedProgressTimeDelta >= progressNotificationTimeInterval) {
-    m_frame->loader().client()->progressEstimateChanged(m_progressValue);
+    frameLoaderClient()->progressEstimateChanged(m_progressValue);
     m_lastNotifiedProgressValue = m_progressValue;
     m_lastNotifiedProgressTime = now;
   }
 }
 
 void ProgressTracker::completeProgress(unsigned long identifier) {
   ProgressItem* item = m_progressItems.get(identifier);
   if (!item)
     return;
 
   item->estimatedLength = item->bytesReceived;
   maybeSendProgress();
 }
 
 }  // namespace blink