Replace AudioSilenceDetector with an AudioPowerMonitor.

base/time.cc

Index: base/time.cc
diff --git a/base/time.cc b/base/time.cc
index 26fd500403e961b0497cfed93b21aee97e6e9174..89c12df60717bd634ad47cbc3951d5c10bd49d3f 100644
--- a/base/time.cc
+++ b/base/time.cc
@@ -5,12 +5,9 @@
 #include "base/time.h"
 
 #include <math.h>
-#if defined(OS_WIN)
-#include <float.h>
-#endif
-
 #include <limits>
 
+#include "base/float_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/third_party/nspr/prtime.h"
 
@@ -18,12 +15,6 @@
 
 namespace base {
 
-namespace {
-#if defined(OS_WIN)
-inline bool isnan(double num) { return !!_isnan(num); }
-#endif
-}
-
 // TimeDelta ------------------------------------------------------------------
 
 int TimeDelta::InDays() const {
@@ -96,7 +87,7 @@ time_t Time::ToTimeT() const {
 
 // static
 Time Time::FromDoubleT(double dt) {
-  if (dt == 0 || isnan(dt))
+  if (dt == 0 || IsNaN(dt))
     return Time();  // Preserve 0 so we can tell it doesn't exist.
   if (dt == std::numeric_limits<double>::max())
     return Max();