Remove disused properties
Fix to reuse the style element
Fix not to share DB transactions in order to avoid creating wasted transactions
Revert "Fix to reuse the style element"

This reverts commit 66f22f97fc4366f7e414ad61af1bae100d22b59e.
Set the type for the style element
Remove an obsolete message type for battle log
Decrease an access to DOM
Fix an issue that causes a JavaScript error when attaching an equipment for Moogle Mail