Enable cpplint for webrtc/examples and fix all uncovered cpplint errors.

webrtc/examples/peerconnection/server/utils.h

Index: webrtc/examples/peerconnection/server/utils.h
diff --git a/webrtc/examples/peerconnection/server/utils.h b/webrtc/examples/peerconnection/server/utils.h
index e70968b87537c80eb0b9dee08db79a40c6855b2c..e1c8729c0bbde5a0f5128d8ca4eafdba0fb4fb64 100644
--- a/webrtc/examples/peerconnection/server/utils.h
+++ b/webrtc/examples/peerconnection/server/utils.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef TALK_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_
-#define TALK_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_
+#ifndef WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_
+#define WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_
 #pragma once
 
 #include <assert.h>
@@ -22,4 +22,4 @@
 std::string int2str(int i);
 std::string size_t2str(size_t i);
 
-#endif  // TALK_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_
+#endif  // WEBRTC_EXAMPLES_PEERCONNECTION_SERVER_UTILS_H_