Oilpan: add missing leftmost trace()s for GC mixins.

Source/modules/beacon/NavigatorBeacon.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/beacon/NavigatorBeacon.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fileapi/Blob.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/DOMFormData.h"
 #include "core/loader/BeaconLoader.h"
 
 namespace blink {
 
 NavigatorBeacon::NavigatorBeacon(Navigator& navigator)
     : m_transmittedBytes(0)
     , m_navigator(navigator)
 {
 }
 
+void NavigatorBeacon::trace(Visitor* visitor)
+{
+    WillBeHeapSupplement<Navigator>::trace(visitor);
+}
+
 const char* NavigatorBeacon::supplementName()
 {
     return "NavigatorBeacon";
 }
 
 NavigatorBeacon& NavigatorBeacon::from(Navigator& navigator)
 {
     NavigatorBeacon* supplement = static_cast<NavigatorBeacon*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
     if (!supplement) {
         supplement = new NavigatorBeacon(navigator);
@@ skipping 70 matching lines @@
         allowed = BeaconLoader::sendBeacon(navigator.frame(), allowance, url, data.getAsString(), bytes);
     else if (data.isFormData())
         allowed = BeaconLoader::sendBeacon(navigator.frame(), allowance, url, data.getAsFormData(), bytes);
     else
         allowed = BeaconLoader::sendBeacon(navigator.frame(), allowance, url, String(), bytes);
 
     return impl.beaconResult(context, allowed, bytes);
 }
 
 } // namespace blink