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/api/audio_codecs/builtin_audio_decoder_factory.cc b/api/audio_codecs/builtin_audio_decoder_factory.cc
index 69a3e7c..45354b6 100644
--- a/api/audio_codecs/builtin_audio_decoder_factory.cc
+++ b/api/audio_codecs/builtin_audio_decoder_factory.cc
@@ -8,27 +8,27 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
+#include "api/audio_codecs/builtin_audio_decoder_factory.h"
 
 #include <memory>
 #include <vector>
 
-#include "webrtc/api/audio_codecs/L16/audio_decoder_L16.h"
-#include "webrtc/api/audio_codecs/audio_decoder_factory_template.h"
-#include "webrtc/api/audio_codecs/g711/audio_decoder_g711.h"
+#include "api/audio_codecs/L16/audio_decoder_L16.h"
+#include "api/audio_codecs/audio_decoder_factory_template.h"
+#include "api/audio_codecs/g711/audio_decoder_g711.h"
 #if WEBRTC_USE_BUILTIN_G722
-#include "webrtc/api/audio_codecs/g722/audio_decoder_g722.h"  // nogncheck
+#include "api/audio_codecs/g722/audio_decoder_g722.h"  // nogncheck
 #endif
 #if WEBRTC_USE_BUILTIN_ILBC
-#include "webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.h"  // nogncheck
+#include "api/audio_codecs/ilbc/audio_decoder_ilbc.h"  // nogncheck
 #endif
 #if WEBRTC_USE_BUILTIN_ISAC_FIX
-#include "webrtc/api/audio_codecs/isac/audio_decoder_isac_fix.h"  // nogncheck
+#include "api/audio_codecs/isac/audio_decoder_isac_fix.h"  // nogncheck
 #elif WEBRTC_USE_BUILTIN_ISAC_FLOAT
-#include "webrtc/api/audio_codecs/isac/audio_decoder_isac_float.h"  // nogncheck
+#include "api/audio_codecs/isac/audio_decoder_isac_float.h"  // nogncheck
 #endif
 #if WEBRTC_USE_BUILTIN_OPUS
-#include "webrtc/api/audio_codecs/opus/audio_decoder_opus.h"  // nogncheck
+#include "api/audio_codecs/opus/audio_decoder_opus.h"  // nogncheck
 #endif
 
 namespace webrtc {