Use while(condition) around monitor wait, in file_system_watcher_macos.
Use while(condition) around monitor wait, in file_system_watcher_macos.

This fixes a potential threading-issue, where the wacther could be used before it was fully initialized, if 'wait' woke up before notify.

BUG=
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//39713002

git-svn-id: c93d8a2297af3b929165606efe145742a534bc71@29163 260f80e4-7a28-3924-810f-c04153c831b5

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