ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

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

Index: third_party/WebKit/Source/core/fileapi/FileReader.h
diff --git a/third_party/WebKit/Source/core/fileapi/FileReader.h b/third_party/WebKit/Source/core/fileapi/FileReader.h
index f1c04cbeee1553aa4519a662c51cbe9498668ce0..ee70d5aff7777ddba8a13c6d294b1a391d5160e7 100644
--- a/third_party/WebKit/Source/core/fileapi/FileReader.h
+++ b/third_party/WebKit/Source/core/fileapi/FileReader.h
@@ -50,7 +50,7 @@ class ExecutionContext;
 class StringOrArrayBuffer;
 
 class CORE_EXPORT FileReader final : public EventTargetWithInlineData,
-                                     public ActiveScriptWrappable,
+                                     public ActiveScriptWrappable<FileReader>,
                                      public SuspendableObject,
                                      public FileReaderLoaderClient {
   DEFINE_WRAPPERTYPEINFO();
@@ -102,10 +102,10 @@ class CORE_EXPORT FileReader final : public EventTargetWithInlineData,
   DECLARE_VIRTUAL_TRACE();
 
  private:
-  explicit FileReader(ExecutionContext*);
-
   class ThrottlingController;
 
+  explicit FileReader(ExecutionContext*);
+
   void terminate();
   void readInternal(Blob*, FileReaderLoader::ReadType, ExceptionState&);
   void fireEvent(const AtomicString& type);