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/audio_processing/ns/defines.h b/modules/audio_processing/ns/defines.h
index 8271332..66b45a9 100644
--- a/modules/audio_processing/ns/defines.h
+++ b/modules/audio_processing/ns/defines.h
@@ -8,8 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
+#ifndef MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
+#define MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
 
 #define BLOCKL_MAX          160 // max processing block length: 160
 #define ANAL_BLOCKL_MAX     256 // max analysis block length: 256
@@ -46,4 +46,4 @@
 #define GAMMA_PAUSE         (float)0.05 // update for conservative noise estimate
 //
 #define B_LIM               (float)0.5  // threshold in final energy gain factor calculation
-#endif // WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_
+#endif // MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_DEFINES_H_