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/common_types.h b/common_types.h
index 9ad5165..db6f0cc 100644
--- a/common_types.h
+++ b/common_types.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_COMMON_TYPES_H_
-#define WEBRTC_COMMON_TYPES_H_
+#ifndef COMMON_TYPES_H_
+#define COMMON_TYPES_H_
 
 #include <stddef.h>
 #include <string.h>
@@ -17,14 +17,14 @@
 #include <string>
 #include <vector>
 
-#include "webrtc/api/array_view.h"
-#include "webrtc/api/optional.h"
-#include "webrtc/api/video/video_content_type.h"
-#include "webrtc/api/video/video_rotation.h"
-#include "webrtc/api/video/video_timing.h"
-#include "webrtc/rtc_base/checks.h"
-#include "webrtc/rtc_base/deprecation.h"
-#include "webrtc/typedefs.h"
+#include "api/array_view.h"
+#include "api/optional.h"
+#include "api/video/video_content_type.h"
+#include "api/video/video_rotation.h"
+#include "api/video/video_timing.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/deprecation.h"
+#include "typedefs.h"
 
 #if defined(_MSC_VER)
 // Disable "new behavior: elements of array will be default initialized"
@@ -972,4 +972,4 @@
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_COMMON_TYPES_H_
+#endif  // COMMON_TYPES_H_