[Mac Fix-It] Changed OpenApplicationWithPath to use NSWorkspace.

This removes base::mac::FSRefFromPath usage from
OpenApplicationWithPath. |FSRefFromPath| is relying on deprecated API
and should be removed.

BUG=650854

Review-Url: https://codereview.chromium.org/2390953003
Cr-Commit-Position: refs/heads/master@{#423391}
8 files changed