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/rtc_base/httpcommon.cc b/rtc_base/httpcommon.cc
index a45d922..a22f0a6 100644
--- a/rtc_base/httpcommon.cc
+++ b/rtc_base/httpcommon.cc
@@ -21,16 +21,16 @@
 
 #include <algorithm>
 
-#include "webrtc/rtc_base/arraysize.h"
-#include "webrtc/rtc_base/base64.h"
-#include "webrtc/rtc_base/checks.h"
-#include "webrtc/rtc_base/cryptstring.h"
-#include "webrtc/rtc_base/httpcommon-inl.h"
-#include "webrtc/rtc_base/httpcommon.h"
-#include "webrtc/rtc_base/messagedigest.h"
-#include "webrtc/rtc_base/socketaddress.h"
-#include "webrtc/rtc_base/stringencode.h"
-#include "webrtc/rtc_base/stringutils.h"
+#include "rtc_base/arraysize.h"
+#include "rtc_base/base64.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/cryptstring.h"
+#include "rtc_base/httpcommon-inl.h"
+#include "rtc_base/httpcommon.h"
+#include "rtc_base/messagedigest.h"
+#include "rtc_base/socketaddress.h"
+#include "rtc_base/stringencode.h"
+#include "rtc_base/stringutils.h"
 
 namespace rtc {