[Tizen] Application resource protection implementation

This PR contains whole mechanism for tizen application encryption and decryption, which includes:
- Addition of the attribute "encryption" in the tizen:setting in config.xml.
- Implementation of encryption during installation of application and decryption during application launch
- Implementation of EncryptData and DecryptData methods which use chromium's crypto module and tizen's secure storage.

BUG=XWALK-1172
weak_factory_ should be still private, and it should be declared last.