Fixing WebRTC after moving from src/webrtc to src/

In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC
from src/webrtc to src/ (in order to preserve an healthy git history).
This CL takes care of fixing header guards, #include paths, etc...

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org


Bug: chromium:611808
Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578
Reviewed-on: https://webrtc-review.googlesource.com/1561
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19846}
diff --git a/test/rtp_file_reader.h b/test/rtp_file_reader.h
index c132d31..75b3b86 100644
--- a/test/rtp_file_reader.h
+++ b/test/rtp_file_reader.h
@@ -7,13 +7,13 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
-#ifndef WEBRTC_TEST_RTP_FILE_READER_H_
-#define WEBRTC_TEST_RTP_FILE_READER_H_
+#ifndef TEST_RTP_FILE_READER_H_
+#define TEST_RTP_FILE_READER_H_
 
 #include <set>
 #include <string>
 
-#include "webrtc/common_types.h"
+#include "common_types.h"
 
 namespace webrtc {
 namespace test {
@@ -46,4 +46,4 @@
 };
 }  // namespace test
 }  // namespace webrtc
-#endif  // WEBRTC_TEST_RTP_FILE_READER_H_
+#endif  // TEST_RTP_FILE_READER_H_