Revert of Remove unnecessary uses of GarbageCollectedFinalized<>.

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 7b15720b0c185138abbe59ac0e20d9a54ecc716e..c1ae6ec94af332be5144abb82f9d819078f97dc1 100644
--- a/third_party/WebKit/Source/core/fileapi/FileReader.cpp
+++ b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
@@ -69,7 +69,7 @@
 static const size_t kMaxOutstandingRequestsPerThread = 100;
 static const double progressNotificationIntervalMS = 50;
 
-class FileReader::ThrottlingController final : public GarbageCollected<FileReader::ThrottlingController>, public Supplement<ExecutionContext> {
+class FileReader::ThrottlingController final : public GarbageCollectedFinalized<FileReader::ThrottlingController>, public Supplement<ExecutionContext> {
     USING_GARBAGE_COLLECTED_MIXIN(FileReader::ThrottlingController);
 public:
     static ThrottlingController* from(ExecutionContext* context)
@@ -84,6 +84,8 @@
         }
         return controller;
     }
+
+    ~ThrottlingController() { }
 
     enum FinishReaderType { DoNotRunPendingReaders, RunPendingReaders };