Oilpan: Build fix after r196532

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index 12281e5df30ea9e12dfd4c06386e34a991209a78..8802ef2a1bde820983b60631b8d41e5f44abf058 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -290,7 +290,7 @@ void FrameLoader::replaceDocumentWhileExecutingJavaScriptURL(const String& sourc
 void FrameLoader::setHistoryItemStateForCommit(HistoryCommitType historyCommitType, HistoryNavigationType navigationType)
 {
     RefPtrWillBeRawPtr<HistoryItem> oldItem = m_currentItem;
-    m_currentItem = historyCommitType == BackForwardCommit ? m_provisionalItem.release() : HistoryItem::create();
+    m_currentItem = historyCommitType == BackForwardCommit ? RawPtr<HistoryItem>(m_provisionalItem.release()) : HistoryItem::create();
     m_currentItem->setURL(m_documentLoader->urlForHistory());
     m_currentItem->setDocumentState(m_frame->document()->formElementsState());
     m_currentItem->setTarget(m_frame->tree().uniqueName());