Fixing root_files WATCHLIST regex.
Fixing root_files WATCHLIST regex.

Bug: webrtc:9152
Change-Id: I881ebae98063a20b8981b71eb2507545651a3e63
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/71024
Reviewed-by: Niklas Enbom <d04c59561b05bea19fa045b0a9e27eab90716ff5@webrtc.org>
Commit-Queue: Niklas Enbom <d04c59561b05bea19fa045b0a9e27eab90716ff5@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#22929}
TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc