Introduce an injection point to configure the internal pointer of WeakPtr

third_party/WebKit/Source/wtf/WeakPtr.h

Index: third_party/WebKit/Source/wtf/WeakPtr.h
diff --git a/third_party/WebKit/Source/wtf/WeakPtr.h b/third_party/WebKit/Source/wtf/WeakPtr.h
index 5b790e4055a5880e374d02f88fb56bc048eab843..69a800a761e2dff26f2038c37303466a8b08e303 100644
--- a/third_party/WebKit/Source/wtf/WeakPtr.h
+++ b/third_party/WebKit/Source/wtf/WeakPtr.h
@@ -31,30 +31,34 @@
 
 namespace WTF {
 
-template<typename T>
-using WeakPtr = base::WeakPtr<T>;
+template <typename T, typename Traits = base::DefaultWeakPtrTraits>
+using WeakPtr = base::WeakPtr<T, Traits>;
+
+template <typename T, typename Traits = base::DefaultWeakPtrTraits>
+class WeakPtrFactory : public base::WeakPtrFactory<T, Traits> {
+    WTF_MAKE_NONCOPYABLE(WeakPtrFactory);
+    DISALLOW_NEW();
+
+private:
+    using Base = base::WeakPtrFactory<T, Traits>;
 
-template<typename T>
-class WeakPtrFactory {
-    WTF_MAKE_NONCOPYABLE(WeakPtrFactory<T>);
-    USING_FAST_MALLOC(WeakPtrFactory);
 public:
-    explicit WeakPtrFactory(T* ptr) : m_factory(ptr) { }
+    explicit WeakPtrFactory(T* ptr)
+        : Base(ptr)
+    {
+    }
 
-    WeakPtr<T> createWeakPtr() { return m_factory.GetWeakPtr(); }
+    WeakPtr<T, Traits> createWeakPtr() { return this->GetWeakPtr(); }
 
     void revokeAll()
     {
-        m_factory.InvalidateWeakPtrs();
+        this->InvalidateWeakPtrs();
     }
 
     bool hasWeakPtrs() const
     {
-        return m_factory.HasWeakPtrs();
+        return this->HasWeakPtrs();
     }
-
-private:
-    base::WeakPtrFactory<T> m_factory;
 };
 
 } // namespace WTF