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

Source/modules/webdatabase/SQLTransaction.idl

Index: Source/modules/webdatabase/SQLTransaction.idl
diff --git a/Source/modules/webdatabase/SQLTransaction.idl b/Source/modules/webdatabase/SQLTransaction.idl
index 2213ed76931e0a8c8e406d4551cddf30bf541490..42340fec6e4874937117ccee5b8685ba6207b725 100644
--- a/Source/modules/webdatabase/SQLTransaction.idl
+++ b/Source/modules/webdatabase/SQLTransaction.idl
@@ -26,13 +26,19 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// http://www.w3.org/TR/webdatabase/#sqltransaction
+
+typedef sequence<any> ObjectArray;
+
 [
     GarbageCollected,
     NoInterfaceObject,
 ] interface SQLTransaction {
-    [Custom] void executeSql(DOMString sqlStatement,
-                             object[] arguments,
-                             optional SQLStatementCallback callback,
-                             optional SQLStatementErrorCallback errorCallback);
+    // The spec defines |arguments| to be an "optional ObjectArray" though it defines the
+    // behavior when null is being passed.
+    [RaisesException] void executeSql(DOMString sqlStatement,
+                                      optional ObjectArray? arguments,
+                                      optional SQLStatementCallback callback,
+                                      optional SQLStatementErrorCallback errorCallback);
 
 };