[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/core/fileapi/FileReader.cpp

Index: third_party/WebKit/Source/core/fileapi/FileReader.cpp
diff --git a/third_party/WebKit/Source/core/fileapi/FileReader.cpp b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
index 336955dded3189755f71e4088820046be896791a..e2bf23861efa672b41dd104b8db8f572998e903d 100644
--- a/third_party/WebKit/Source/core/fileapi/FileReader.cpp
+++ b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
@@ -202,7 +202,8 @@ FileReader* FileReader::create(ExecutionContext* context)
 }
 
 FileReader::FileReader(ExecutionContext* context)
-    : ActiveDOMObject(context)
+    : ActiveScriptWrappable(this)
+    , ActiveDOMObject(context)
     , m_state(EMPTY)
     , m_loadingState(LoadingStateNone)
     , m_readType(FileReaderLoader::ReadAsBinaryString)