content: fix mac owner patterns

*_mac* matches (eg) common_param_traits_macros.h :)

Bug: None
Change-Id: Ibb573d8a98eb2ecf13b7946fe7f5616cfd07384b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893351Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711273}

content/OWNERS

@@ -24,10 +24,14 @@ per-file *browser_thread*=gab@chromium.org
 per-file *_fuchsia*=file://build/fuchsia/OWNERS
 
 # For Mac-specific changes:
-per-file *_mac*=ellyjones@chromium.org
-per-file *_mac*=mark@chromium.org
-per-file *_mac*=rsesek@chromium.org
-per-file *_mac*=tapted@chromium.org
+per-file *_mac.*=ellyjones@chromium.org
+per-file *_mac.*=mark@chromium.org
+per-file *_mac.*=rsesek@chromium.org
+per-file *_mac.*=tapted@chromium.org
+per-file *_mac_*=ellyjones@chromium.org
+per-file *_mac_*=mark@chromium.org
+per-file *_mac_*=rsesek@chromium.org
+per-file *_mac_*=tapted@chromium.org
 per-file *.mm=ellyjones@chromium.org
 per-file *.mm=mark@chromium.org
 per-file *.mm=rsesek@chromium.org