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/desktop_capture/fake_desktop_capturer.h b/modules/desktop_capture/fake_desktop_capturer.h
index 9cab2d6..cb1cfe1 100644
--- a/modules/desktop_capture/fake_desktop_capturer.h
+++ b/modules/desktop_capture/fake_desktop_capturer.h
@@ -8,15 +8,15 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
-#define WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
+#ifndef MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
+#define MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
 
 #include <memory>
 
-#include "webrtc/modules/desktop_capture/desktop_capturer.h"
-#include "webrtc/modules/desktop_capture/desktop_capture_types.h"
-#include "webrtc/modules/desktop_capture/desktop_frame_generator.h"
-#include "webrtc/modules/desktop_capture/shared_memory.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_frame_generator.h"
+#include "modules/desktop_capture/shared_memory.h"
 
 namespace webrtc {
 
@@ -73,4 +73,4 @@
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_
+#endif  // MODULES_DESKTOP_CAPTURE_FAKE_DESKTOP_CAPTURER_H_