[issue16996] Reuse shutil.which() in webbrowser module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 050c94f5f72c by Serhiy Storchaka in branch 'default':
Issue #16996: webbrowser module now uses shutil.which() to find a
http://hg.python.org/cpython/rev/050c94f5f72c

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nosy: +python-dev

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<http://bugs.python.org/issue16996>
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