Migrate WTF::HashSet::remove() to ::erase() [part 1]

third_party/WebKit/Source/platform/LifecycleNotifier.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2013 Google 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
@@ skipping 139 matching lines @@
 
 template <typename T, typename Observer>
 inline void LifecycleNotifier<T, Observer>::removeObserver(Observer* observer) {
   // If immediate removal isn't currently allowed,
   // |observer| is recorded for pending removal.
   if (m_iterationState & AllowPendingRemoval) {
     m_observers.insert(observer);
     return;
   }
   RELEASE_ASSERT(m_iterationState & AllowingRemoval);
-  m_observers.remove(observer);
+  m_observers.erase(observer);
 }
 
 }  // namespace blink
 
 #endif  // LifecycleNotifier_h