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/typedefs.h b/typedefs.h
index bd0bee7..629cded 100644
--- a/typedefs.h
+++ b/typedefs.h
@@ -11,8 +11,8 @@
 // This file contains platform-specific typedefs and defines.
 // Much of it is derived from Chromium's build/build_config.h.
 
-#ifndef WEBRTC_TYPEDEFS_H_
-#define WEBRTC_TYPEDEFS_H_
+#ifndef TYPEDEFS_H_
+#define TYPEDEFS_H_
 
 // Processor architecture detection.  For more info on what's defined, see:
 //   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
@@ -122,4 +122,4 @@
 #define RTC_UNUSED(x) static_cast<void>(x)
 #endif  // RTC_UNUSED
 
-#endif  // WEBRTC_TYPEDEFS_H_
+#endif  // TYPEDEFS_H_