chrome: Simplify CPP files regex.

This regex can be simplified down to a single-one.

Similar to the way we already do elsewhere, like in //cc
(https://chromium.googlesource.com/chromium/src/+/master/cc/PRESUBMIT.py) and
ui/app_list
(https://chromium.googlesource.com/chromium/src/+/master/ui/app_list/PRESUBMIT.py)

BUG=None
TEST=git cl presubmit -uv
[email protected]

Review URL: https://codereview.chromium.org/984073005

Cr-Commit-Position: refs/heads/master@{#319573}
diff --git a/chrome/PRESUBMIT.py b/chrome/PRESUBMIT.py
index 9f4eefa7..195a5f6c 100644
--- a/chrome/PRESUBMIT.py
+++ b/chrome/PRESUBMIT.py
@@ -11,7 +11,7 @@
 import re
 
 INCLUDE_CPP_FILES_ONLY = (
-  r'.*\.cc$', r'.*\.h$'
+  r'.*\.(cc|h)$',
 )
 
 EXCLUDE = (