Remove find_xcode.py's prefix-matching workaround
Remove find_xcode.py's prefix-matching workaround

BUG=461005
TBR=sergeyberezin,stuartmorgan

Review URL: https://codereview.chromium.org/953653004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294185 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build