Drop V8RecursionScope dependency on ExecutionContext

Source/modules/indexeddb/IDBPendingTransactionMonitor.h

Index: Source/modules/indexeddb/IDBPendingTransactionMonitor.h
diff --git a/Source/modules/indexeddb/IDBPendingTransactionMonitor.h b/Source/modules/indexeddb/IDBPendingTransactionMonitor.h
index 6d4b4d94d64921433831e8989b04d0d862c28ab6..fc2d943b4c6cf426c1f1867b79073b015dcb0bff 100644
--- a/Source/modules/indexeddb/IDBPendingTransactionMonitor.h
+++ b/Source/modules/indexeddb/IDBPendingTransactionMonitor.h
@@ -26,14 +26,11 @@
 #ifndef IDBPendingTransactionMonitor_h
 #define IDBPendingTransactionMonitor_h
 
-#include "platform/Supplementable.h"
+#include "platform/heap/Handle.h"
 #include "wtf/Noncopyable.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/Vector.h"
 
 namespace blink {
 
-class ExecutionContext;
 class IDBTransaction;
 
 // This class keeps track of the transactions created during the current
@@ -41,22 +38,17 @@ class IDBTransaction;
 // which is set to true on creation, but must be set to false when control
 // returns to the event loop.
 
-class IDBPendingTransactionMonitor : public NoBaseWillBeGarbageCollected<IDBPendingTransactionMonitor>, public WillBeHeapSupplement<ExecutionContext> {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(IDBPendingTransactionMonitor);
-    DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(IDBPendingTransactionMonitor);
+class IDBPendingTransactionMonitor {
     WTF_MAKE_NONCOPYABLE(IDBPendingTransactionMonitor);
 
 public:
-    static IDBPendingTransactionMonitor& from(WillBeHeapSupplementable<ExecutionContext>&);
-    virtual void trace(Visitor*) OVERRIDE;
+    IDBPendingTransactionMonitor();
+
     void addNewTransaction(IDBTransaction&);
     void deactivateNewTransactions();
 
 private:
-    IDBPendingTransactionMonitor();
-    static const char* supplementName();
-
-    PersistentHeapVectorWillBeHeapVector<Member<IDBTransaction> > m_transactions;
+    PersistentHeapVector<Member<IDBTransaction> > m_transactions;
 };
 
 } // namespace blink