Adds RefPtr::leakRef method to allow raw pointers that prevent destruct.

third_party/WebKit/Source/wtf/RefPtr.h

Index: third_party/WebKit/Source/wtf/RefPtr.h
diff --git a/third_party/WebKit/Source/wtf/RefPtr.h b/third_party/WebKit/Source/wtf/RefPtr.h
index c6b28fa72555e1e21bf744db89a969596127da1d..6dca0985aac0db86f39a9e777cc190ba2989d457 100644
--- a/third_party/WebKit/Source/wtf/RefPtr.h
+++ b/third_party/WebKit/Source/wtf/RefPtr.h
@@ -70,7 +70,7 @@ class RefPtr {
   ALWAYS_INLINE ~RefPtr() { derefIfNotNull(m_ptr); }
 
   ALWAYS_INLINE T* get() const { return m_ptr; }
-
+  T* leakRef() WARN_UNUSED_RESULT;
   void clear();
   PassRefPtr<T> release() {
     PassRefPtr<T> tmp = adoptRef(m_ptr);
@@ -111,6 +111,13 @@ inline RefPtr<T>::RefPtr(const PassRefPtr<U>& o,
     : m_ptr(o.leakRef()) {}
 
 template <typename T>
+inline T* RefPtr<T>::leakRef() {
+  T* ptr = m_ptr;
+  m_ptr = nullptr;
+  return ptr;
+}
+
+template <typename T>
 inline void RefPtr<T>::clear() {
   T* ptr = m_ptr;
   m_ptr = nullptr;