Post fix of CL "declare a variable before using it"
PVS-Studio pointed out that an uninitialized variable 'limit' is used to
initialize itself, which may cause undefined behavior. Other calls to
StringToSizeT() don't have this issue.
After my landing crrev.com/2724153004 for the fix, the declaration and
assignment of variable |limit| are separate. If somebody adds code
between them, there will be a non-trivial interval of |limit| having an
This CL fixed this by initializing |limit| right after its declaration.