[bindings] Remove SQLTransaction's usage of custom binding.

Source/bindings/modules/v8/V8BindingForModules.h

+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8BindingForModules_h
+#define V8BindingForModules_h
+
+#include "bindings/core/v8/V8Binding.h"
+#include "modules/webdatabase/sqlite/SQLValue.h"
+
+namespace blink {
+
+template <>
+struct NativeValueTraits<SQLValue> {
+    static SQLValue nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
+    {
+        if (value.IsEmpty() || value->IsNull())
+            return SQLValue();
+        if (value->IsNumber())
+            return SQLValue(value->NumberValue());
+        V8StringResource<> stringValue(value);
+        if (!stringValue.prepare(exceptionState))
+            return SQLValue();
+        return SQLValue(stringValue);
+    }
+};
+
+} // namespace blink
+
+#endif // V8BindingForModules_h