Removed obsolete float_util.h as VS2013 supports standards well enough.

cc/base/histograms.cc

Index: cc/base/histograms.cc
diff --git a/cc/base/histograms.cc b/cc/base/histograms.cc
index af1ea661a89569d6f4e09208d9e784a388340ae7..8b284d9c72189efd5b86d57ac64b6dfbf1e44e74 100644
--- a/cc/base/histograms.cc
+++ b/cc/base/histograms.cc
@@ -5,9 +5,9 @@
 #include "cc/base/histograms.h"
 
 #include <algorithm>
+#include <cmath>
 #include <limits>
 
-#include "base/float_util.h"
 #include "base/numerics/safe_conversions.h"
 
 namespace cc {
@@ -38,7 +38,7 @@ void ScopedUMAHistogramAreaTimerBase::GetHistogramValues(
   elapsed = std::max(
       elapsed, base::TimeDelta::FromMicroseconds(kMinimumTimeMicroseconds));
   double area_per_time = area / elapsed.InMillisecondsF();
-  DCHECK(!base::IsNaN(area_per_time));
+  DCHECK(!std::isnan(area_per_time));
   *time_microseconds = base::saturated_cast<Sample>(elapsed.InMicroseconds());
   *pixels_per_ms = base::saturated_cast<Sample>(area_per_time);
 }