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/common_audio/signal_processing/complex_fft_tables.h b/common_audio/signal_processing/complex_fft_tables.h
index ca7b7fe..7f531e9 100644
--- a/common_audio/signal_processing/complex_fft_tables.h
+++ b/common_audio/signal_processing/complex_fft_tables.h
@@ -9,10 +9,10 @@
  */
 
 
-#ifndef WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
-#define WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
 
-#include "webrtc/typedefs.h"
+#include "typedefs.h"
 
 static const int16_t kSinTable1024[] = {
        0,    201,    402,    603,    804,   1005,   1206,   1406,
@@ -145,4 +145,4 @@
    -1607,  -1406,  -1206,  -1005,   -804,   -603,   -402,   -201
 };
 
-#endif  // WEBRTC_COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_