Fix memory leak when navigating from native page

-Cordova RTC work item number: 44618
-Apache Cordova Jira issue: https://issues.apache.org/jira/browse/CB-6924
-IBM PMR: 79005,999,000
-Full description: Memory leak was found when navigating back and forth
between a native and hybrid page. I identified leaks with the
PhoneApplicationService, DOMStorageHelper, and
NativeExecution.ProcessCommand.