Update includes for webrtc/{base => rtc_base} rename (3/3)

webrtc/rtc_base/sigslot.h

 // sigslot.h: Signal/Slot classes
 //
 // Written by Sarah Thompson (sarah@telergy.com) 2002.
 //
 // License: Public domain. You are free to use this code however you like, with
 // the proviso that the author takes on no responsibility or liability for any
 // use.
 //
 // QUICK DOCUMENTATION
 //
@@ skipping 95 matching lines @@
 
 #if defined(SIGSLOT_PURE_ISO) ||                   \
     (!defined(WEBRTC_WIN) && !defined(__GNUG__) && \
      !defined(SIGSLOT_USE_POSIX_THREADS))
 #define _SIGSLOT_SINGLE_THREADED
 #elif defined(WEBRTC_WIN)
 #define _SIGSLOT_HAS_WIN32_THREADS
 #if !defined(WIN32_LEAN_AND_MEAN)
 #define WIN32_LEAN_AND_MEAN
 #endif
-#include "webrtc/base/win32.h"
+#include "webrtc/rtc_base/win32.h"
 #elif defined(__GNUG__) || defined(SIGSLOT_USE_POSIX_THREADS)
 #define _SIGSLOT_HAS_POSIX_THREADS
 #include <pthread.h>
 #else
 #define _SIGSLOT_SINGLE_THREADED
 #endif
 
 #ifndef SIGSLOT_DEFAULT_MT_POLICY
 #ifdef _SIGSLOT_SINGLE_THREADED
 #define SIGSLOT_DEFAULT_MT_POLICY single_threaded
@@ skipping 511 matching lines @@
           typename A6,
           typename A7,
           typename A8,
           typename mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
 using signal8 =
     signal_with_thread_policy<mt_policy, A1, A2, A3, A4, A5, A6, A7, A8>;
 
 }  // namespace sigslot
 
 #endif  // WEBRTC_RTC_BASE_SIGSLOT_H_