Update examples GYP to avoid rtc_base_approved warning.

webrtc/base/urlencode.h

 /*
  *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef _URLENCODE_H_
-#define _URLENCODE_H_ 
+#ifndef WEBRTC_BASE_URLENCODE_H_
+#define WEBRTC_BASE_URLENCODE_H_
 
 #include <string>
 
 namespace rtc {
 
 // Decode all encoded characters. Also decode + as space.
 int UrlDecode(const char *source, char *dest);
 
 // Decode all encoded characters.
 int UrlDecodeWithoutEncodingSpaceAsPlus(const char *source, char *dest);
@@ skipping 11 matching lines @@
 int UrlEncodeOnlyUnsafeChars(const char *source, char *dest, unsigned max);
 
 std::string UrlDecodeString(const std::string & encoded);
 std::string UrlDecodeStringWithoutEncodingSpaceAsPlus(
     const std::string & encoded);
 std::string UrlEncodeString(const std::string & decoded);
 std::string UrlEncodeStringWithoutEncodingSpaceAsPlus(
     const std::string & decoded);
 std::string UrlEncodeStringForOnlyUnsafeChars(const std::string & decoded);
 
-#endif
+#endif  // WEBRTC_BASE_URLENCODE_H_
 
 }  // namespace rtc