Deprecate memory coordinator v0 related histograms

content/browser/memory/memory_coordinator_impl.h

Index: content/browser/memory/memory_coordinator_impl.h
diff --git a/content/browser/memory/memory_coordinator_impl.h b/content/browser/memory/memory_coordinator_impl.h
index f3189b6ea19909041064bbfeddc80e6cf696b465..4374cfc75e737013fef3b39a99ee7f55f304fbcb 100644
--- a/content/browser/memory/memory_coordinator_impl.h
+++ b/content/browser/memory/memory_coordinator_impl.h
@@ -180,11 +180,6 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public base::MemoryCoordinator,
   // Notifies a state change to child processes.
   void NotifyStateToChildren();
 
-  // Records metrics. This is called when the global state is changed.
-  void RecordStateChange(MemoryState prev_state,
-                         MemoryState next_state,
-                         base::TimeDelta duration);
-
   std::unique_ptr<MemoryCoordinatorDelegate> delegate_;
   std::unique_ptr<MemoryMonitor> memory_monitor_;
   std::unique_ptr<MemoryStateUpdater> state_updater_;