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/modules/video_coding/include/video_coding.h b/modules/video_coding/include/video_coding.h
index 93220a2..d204f19 100644
--- a/modules/video_coding/include/video_coding.h
+++ b/modules/video_coding/include/video_coding.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_
-#define WEBRTC_MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_
+#ifndef MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_
+#define MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_
 
 #if defined(WEBRTC_WIN)
 // This is a workaround on Windows due to the fact that some Windows
@@ -21,11 +21,11 @@
 #include <windows.h>
 #endif
 
-#include "webrtc/api/video/video_frame.h"
-#include "webrtc/modules/include/module.h"
-#include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/modules/video_coding/include/video_coding_defines.h"
-#include "webrtc/system_wrappers/include/event_wrapper.h"
+#include "api/video/video_frame.h"
+#include "modules/include/module.h"
+#include "modules/include/module_common_types.h"
+#include "modules/video_coding/include/video_coding_defines.h"
+#include "system_wrappers/include/event_wrapper.h"
 
 namespace webrtc {
 
@@ -418,4 +418,4 @@
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_
+#endif  // MODULES_VIDEO_CODING_INCLUDE_VIDEO_CODING_H_