[Tizen]Move global constant values into proper namespace.

The widget configuration keys and preset values should be included inside the namespace "application_widget_keys".
Merge pull request #2684 from yejingfu/fix-widget

[Tizen]Move global constant values into proper namespace.
[TIZEN] Runtime has no chance to get remote debug flag

The first created Runtime has no chance to notify its application
(observer) to update its remote debug flag.

BUG=https://crosswalk-project.org/jira/browse/XWALK-3080
Merge pull request #2688 from wuyuehang/XWALK-3080

[TIZEN] Runtime has no chance to get remote debug flag