PRESUBMIT: Enable header guard checks for cpplint.

This check has always been disabled since the start in since it didn't support
our style guide back then (wanted our source code to be prefixed
with SRC_ in the header guards). I belive this was later fixed in At least it can now
be enabled.


Review URL:

Cr-Commit-Position: refs/heads/master@{#10482}
diff --git a/ b/
index e7ceac9..a832761 100755
--- a/
+++ b/
@@ -68,13 +68,6 @@
   # pylint: disable=W0212
-  # Justifications for each filter:
-  #
-  # - build/header_guard  : WebRTC coding style says they should be prefixed
-  #                         with WEBRTC_, which is not possible to configure in
-  #               
-  cpplint._SetFilters('-build/header_guard')
   # Use the strictest verbosity level for (level 1) which is the
   # default when running from command line.
   # To make it possible to work with not-yet-converted code, we're only applying