[Time] Solve instanceof problem
[Time] Solve instanceof problem

Some tests are checking the type of methods return.

For example:
assert_true(returnedValue instanceof tizen.TZDate, "TZDate check");

The way tizen.TZDate was implemented, some methods were returning
instanceof 'undefined'.

Now with this other way to implement tizen.TZDate, the methods are
returning the correct 'instanceof'.

pk-sam/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,hgl888/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,crosswalk-project/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk,paritosh-in/tizen-extensions-crosswalk,pk-sam/tizen-extensions-crosswalk