Merge NetworkTimeNotifier to NetworkTimeTracker

chrome/browser/upgrade_detector_impl.h

Index: chrome/browser/upgrade_detector_impl.h
diff --git a/chrome/browser/upgrade_detector_impl.h b/chrome/browser/upgrade_detector_impl.h
index 30bf7b02a83b32fde4f0898b1ef6a005794d298c..14d1f44d878fb7f13b63d77ef45dc5fad4eae293 100644
--- a/chrome/browser/upgrade_detector_impl.h
+++ b/chrome/browser/upgrade_detector_impl.h
@@ -7,7 +7,6 @@
 
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
-#include "chrome/browser/network_time/network_time_tracker.h"
 #include "chrome/browser/upgrade_detector.h"
 
 template <typename T> struct DefaultSingletonTraits;
@@ -72,9 +71,6 @@ class UpgradeDetectorImpl : public UpgradeDetector {
   // The date the binaries were built.
   base::Time build_date_;
 
-  // Tracker for getting network time.
-  NetworkTimeTracker network_time_tracker_;
-
   DISALLOW_COPY_AND_ASSIGN(UpgradeDetectorImpl);
 };