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/bitrate_controller/bitrate_controller_unittest.cc b/modules/bitrate_controller/bitrate_controller_unittest.cc
index a012998..ab9928f 100644
--- a/modules/bitrate_controller/bitrate_controller_unittest.cc
+++ b/modules/bitrate_controller/bitrate_controller_unittest.cc
@@ -11,12 +11,12 @@
 #include <algorithm>
 #include <vector>
 
-#include "webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h"
-#include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
-#include "webrtc/modules/pacing/mock/mock_paced_sender.h"
-#include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
-#include "webrtc/test/field_trial.h"
-#include "webrtc/test/gtest.h"
+#include "logging/rtc_event_log/mock/mock_rtc_event_log.h"
+#include "modules/bitrate_controller/include/bitrate_controller.h"
+#include "modules/pacing/mock/mock_paced_sender.h"
+#include "modules/remote_bitrate_estimator/include/bwe_defines.h"
+#include "test/field_trial.h"
+#include "test/gtest.h"
 
 using ::testing::Exactly;
 using ::testing::Return;