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/call/call_unittest.cc b/call/call_unittest.cc
index e342dfa..b1ebb82 100644
--- a/call/call_unittest.cc
+++ b/call/call_unittest.cc
@@ -13,22 +13,22 @@
 #include <memory>
 #include <utility>
 
-#include "webrtc/api/test/mock_audio_mixer.h"
-#include "webrtc/call/audio_state.h"
-#include "webrtc/call/call.h"
-#include "webrtc/call/fake_rtp_transport_controller_send.h"
-#include "webrtc/logging/rtc_event_log/rtc_event_log.h"
-#include "webrtc/modules/audio_device/include/mock_audio_device.h"
-#include "webrtc/modules/audio_mixer/audio_mixer_impl.h"
-#include "webrtc/modules/congestion_controller/include/mock/mock_send_side_congestion_controller.h"
-#include "webrtc/modules/pacing/mock/mock_paced_sender.h"
-#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp.h"
-#include "webrtc/rtc_base/ptr_util.h"
-#include "webrtc/test/fake_encoder.h"
-#include "webrtc/test/gtest.h"
-#include "webrtc/test/mock_audio_decoder_factory.h"
-#include "webrtc/test/mock_transport.h"
-#include "webrtc/test/mock_voice_engine.h"
+#include "api/test/mock_audio_mixer.h"
+#include "call/audio_state.h"
+#include "call/call.h"
+#include "call/fake_rtp_transport_controller_send.h"
+#include "logging/rtc_event_log/rtc_event_log.h"
+#include "modules/audio_device/include/mock_audio_device.h"
+#include "modules/audio_mixer/audio_mixer_impl.h"
+#include "modules/congestion_controller/include/mock/mock_send_side_congestion_controller.h"
+#include "modules/pacing/mock/mock_paced_sender.h"
+#include "modules/rtp_rtcp/include/rtp_rtcp.h"
+#include "rtc_base/ptr_util.h"
+#include "test/fake_encoder.h"
+#include "test/gtest.h"
+#include "test/mock_audio_decoder_factory.h"
+#include "test/mock_transport.h"
+#include "test/mock_voice_engine.h"
 
 namespace {