Cleanup in EmulatorClipboardMonitor (2)

The whole `openPipe` function does not
have to be synchronized.

Bug: 231345789
Test: presubmit
Signed-off-by: Roman Kiryanov <rkir@google.com>
Change-Id: I5241086c947a4227fb32648f0693303be66f4d46
1 file changed