Use std::isfinite().

base/float_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_FLOAT_UTIL_H_
 #define BASE_FLOAT_UTIL_H_
 
 #include "build/build_config.h"
 
 #include <float.h>
-#include <math.h>
+
+#include <cmath>
 
 namespace base {
 
 inline bool IsFinite(const double& number) {
-#if defined(OS_ANDROID)
-  // isfinite isn't available on Android: http://b.android.com/34793
-  return finite(number) != 0;
-#elif defined(OS_POSIX)
-  return isfinite(number) != 0;
+#if defined(OS_POSIX)
+  return std::isfinite(number) != 0;
 #elif defined(OS_WIN)
   return _finite(number) != 0;
 #endif
 }
 
 }  // namespace base
 
 #endif  // BASE_FLOAT_UTIL_H_