Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/IntersectionObserver.cpp

 // Copyright 2016 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 "core/dom/IntersectionObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "core/css/parser/CSSTokenizer.h"
 #include "core/dom/ExceptionCode.h"
@@ skipping 64 matching lines @@
             exceptionState.throwRangeError("Threshold values must be between 0 and 1");
             break;
         }
     }
 
     std::sort(thresholds.begin(), thresholds.end());
 }
 
 IntersectionObserver* IntersectionObserver::create(const IntersectionObserverInit& observerInit, IntersectionObserverCallback& callback, ExceptionState& exceptionState)
 {
-    RefPtrWillBeRawPtr<Node> root = observerInit.root();
+    RawPtr<Node> root = observerInit.root();
     if (!root) {
         // TODO(szager): Use Document instead of document element for implicit root. (crbug.com/570538)
         ExecutionContext* context = callback.getExecutionContext();
         ASSERT(context->isDocument());
         Frame* mainFrame = toDocument(context)->frame()->tree().top();
         if (mainFrame && mainFrame->isLocalFrame())
             root = toLocalFrame(mainFrame)->document();
     }
     if (!root) {
         exceptionState.throwDOMException(HierarchyRequestError, "Unable to get root node in main frame to track.");
@@ skipping 214 matching lines @@
 {
 #if ENABLE(OILPAN)
     visitor->template registerWeakMembers<IntersectionObserver, &IntersectionObserver::clearWeakMembers>(this);
 #endif
     visitor->trace(m_callback);
     visitor->trace(m_observations);
     visitor->trace(m_entries);
 }
 
 } // namespace blink