Pass '-f' option to rm command so that it won't report an error if the file to
be removed does not exist for any reason.

llvm-svn: 116025
diff --git a/lldb/test/breakpoint_command/TestBreakpointCommand.py b/lldb/test/breakpoint_command/TestBreakpointCommand.py
index 5597ee9..d9e2ec6 100644
--- a/lldb/test/breakpoint_command/TestBreakpointCommand.py
+++ b/lldb/test/breakpoint_command/TestBreakpointCommand.py
@@ -13,7 +13,7 @@
 
     @classmethod
     def classCleanup(cls):
-        system(["/bin/sh", "-c", "rm output.txt"])
+        system(["/bin/sh", "-c", "rm -f output.txt"])
 
     @unittest2.skipUnless(sys.platform.startswith("darwin"), "requires Darwin")
     def test_with_dsym(self):