Add new SQLError implementation.
        
        * DerivedSources.make:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * storage/SQLError.h: Added.
        (WebCore::SQLError::SQLError):
        (WebCore::SQLError::code):
        (WebCore::SQLError::message):
        * storage/SQLError.idl: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27328 268f45cc-cd09-0410-ab3c-d52691b4dbfc