Delete Timing class, timing.h, and update all users.

webrtc/base/timeutils.cc

Index: webrtc/base/timeutils.cc
diff --git a/webrtc/base/timeutils.cc b/webrtc/base/timeutils.cc
index 1be368eb5847a95cca75833ee0e4d0e57644afcd..71a715d7d39b4e1864385c42c4ce68d21c7b9092 100644
--- a/webrtc/base/timeutils.cc
+++ b/webrtc/base/timeutils.cc
@@ -23,6 +23,7 @@
 #endif
 #include <windows.h>
 #include <mmsystem.h>
+#include <sys/timeb.h>
 #endif
 
 #include "webrtc/base/checks.h"
@@ -185,4 +186,21 @@ int64_t TmToSeconds(const std::tm& tm) {
             (year - 1970) * 365 + day) * 24 + hour) * 60 + min) * 60 + sec;
 }
 
+double WallClockSeconds() {
+#if defined(WEBRTC_POSIX)
+  struct timeval time;
+  gettimeofday(&time, NULL);
+  // Convert from second (1.0) and microsecond (1e-6).
+  return (static_cast<double>(time.tv_sec) +
+          static_cast<double>(time.tv_usec) * 1.0e-6);
+
+#elif defined(WEBRTC_WIN)
+  struct _timeb time;
+  _ftime(&time);
+  // Convert from second (1.0) and milliseconds (1e-3).
+  return (static_cast<double>(time.time) +
+          static_cast<double>(time.millitm) * 1.0e-3);
+#endif
+}
+
 } // namespace rtc