Remove unwanted copyToVector() uses.

third_party/WebKit/Source/core/timing/PerformanceBase.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 392 matching lines @@
         if (!suspended[i]->shouldBeSuspended()) {
             m_suspendedObservers.remove(suspended[i]);
             activateObserver(*suspended[i]);
         }
     }
 }
 
 void PerformanceBase::deliverObservationsTimerFired(Timer<PerformanceBase>*)
 {
     ASSERT(isMainThread());
-    PerformanceObserverVector observers;
-    copyToVector(m_activeObservers, observers);
-    m_activeObservers.clear();
-    for (size_t i = 0; i < observers.size(); ++i) {
-        if (observers[i]->shouldBeSuspended())
-            m_suspendedObservers.add(observers[i]);
+    PerformanceObservers observers;
+    m_activeObservers.swap(observers);
+    for (const auto& observer : observers) {
+        if (observer->shouldBeSuspended())
+            m_suspendedObservers.add(observer);
         else
-            observers[i]->deliver();
+            observer->deliver();
     }
 }
 
 // static
 double PerformanceBase::clampTimeResolution(double timeSeconds)
 {
     const double resolutionSeconds = 0.000005;
     return floor(timeSeconds / resolutionSeconds) * resolutionSeconds;
 }
 
@@ skipping 17 matching lines @@
     visitor->trace(m_frameTimingBuffer);
     visitor->trace(m_resourceTimingBuffer);
     visitor->trace(m_userTiming);
     visitor->trace(m_observers);
     visitor->trace(m_activeObservers);
     visitor->trace(m_suspendedObservers);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink