Disable implicit conversion of scoped_refptr<T> to T* on Windows.

base/win/scoped_comptr.h

Index: base/win/scoped_comptr.h
diff --git a/base/win/scoped_comptr.h b/base/win/scoped_comptr.h
index 98cea0ff4c8a45f8612cdab90e7882d85b7e25c1..373c0c3ba50985bb83c4a93b3626def6601a9977 100644
--- a/base/win/scoped_comptr.h
+++ b/base/win/scoped_comptr.h
@@ -133,8 +133,7 @@ class ScopedComPtr : public scoped_refptr<Interface> {
     ScopedComPtr<IUnknown> other_identity;
     other->QueryInterface(other_identity.Receive());
 
-    return static_cast<IUnknown*>(my_identity) ==
-           static_cast<IUnknown*>(other_identity);
+    return my_identity == other_identity;
   }
 
   // Provides direct access to the interface.