Cleanup iOS simulator homedir on test teardown
Cleanup iOS simulator homedir on test teardown

BUG=452193
TESTED=made change manually on bot, tried it out

Review URL: https://codereview.chromium.org/936823003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294127 0039d316-1c4b-4281-b951-d872f2087c98

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