Summary:
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There was an issue for some characters in newer android API versions. One option was to fix our implementation, which can be done by casting to char to unsigned int before using std::isalnum.
But, do not duplicate existing functionality, used a solid implementation instead.
Changelog: Fixes an issue whereas the url encoding was incorrect for UTF-8
Reviewed By: mweststrate
Differential Revision: D33405760
fbshipit-source-id: e1c0a4da3dceb27e923b26d0ebfac091febeceb3
f3b0c82f4d