Use simpler per-file syntax.

* Add owners to clang.go and tidy.go.

Test: build/make/tools/checkowners.py -c -v OWNERS
Change-Id: I28e5b1feb89d24cb26c9907368fb5f01533d283e
diff --git a/OWNERS b/OWNERS
index 121a441..edd2557 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,11 +1,3 @@
-ccross@android.com
-dwillemsen@google.com
-nanzhang@google.com
-
-per-file * = ccross@android.com
-per-file * = dwillemsen@google.com
-per-file * = nanzhang@google.com
-per-file *gen_stub_libs.py = danalbert@google.com
-per-file ndk_*.go = danalbert@google.com
-per-file clang.go = srhines@google.com
-per-file global.go = srhines@google.com
+per-file * = ccross@android.com,dwillemsen@google.com,nanzhang@google.com
+per-file ndk_*.go, *gen_stub_libs.py = danalbert@google.com
+per-file clang.go,global.go,tidy.go = srhines@google.com, chh@google.com