[bindings] Migrate V8TestingScope out of V8Binding.h/cpp

Source/modules/indexeddb/IDBTransactionTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/indexeddb/IDBTransaction.h"
 
+#include "bindings/core/v8/V8TestingScope.h"
 #include "core/dom/DOMError.h"
 #include "core/dom/Document.h"
 #include "modules/indexeddb/IDBDatabase.h"
 #include "modules/indexeddb/IDBDatabaseCallbacks.h"
 #include "platform/SharedBuffer.h"
 #include "public/platform/WebIDBDatabase.h"
 #include <gtest/gtest.h>
 #include <v8.h>
 
 namespace blink {
@@ skipping 116 matching lines @@
     // will not fail if it is, but ASAN would notice the error.
     db->onAbort(transactionId, DOMError::create(AbortError, "Aborted"));
 
     // onAbort() should have cleared the transaction's reference to the database.
     Heap::collectAllGarbage();
     EXPECT_EQ(0u, set.size());
 }
 
 } // namespace
 } // namespace blink