Fix cpplint errors in p2p/

Bug: webrtc:5273
Change-Id: Ida3c2ca1bbb611026f34d7144db9ec24840bf7fb
Reviewed-on: https://webrtc-review.googlesource.com/26444
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21133}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 5d9f459..ea7c6a2 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -32,7 +32,11 @@
   'modules/media_file',
   'modules/utility',
   'modules/video_capture',
-  'p2p',
+  'p2p/base/sessiondescription.cc',
+  'p2p/base/session.cc',
+  'p2p/base/session.h',
+  'p2p/base/pseudotcp.cc',
+  'p2p/base/pseudotcp.h',
   'rtc_base',
   'sdk/android/src/jni',
   'sdk/objc',