Simplify SMILTime operators

Source/core/svg/animation/SMILTime.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #include "config.h"
 
 #include "core/svg/animation/SMILTime.h"
 
 #include <float.h>
 
 using namespace blink;
 
-SMILTime blink::operator+(const SMILTime& a, const SMILTime& b)
-{
-    if (a.isUnresolved() || b.isUnresolved())
-        return SMILTime::unresolved();
-    if (a.isIndefinite() || b.isIndefinite())
-        return SMILTime::indefinite();
-    return a.value() + b.value();
-}
-
-SMILTime blink::operator-(const SMILTime& a, const SMILTime& b)
-{
-    if (a.isUnresolved() || b.isUnresolved())
-        return SMILTime::unresolved();
-    if (a.isIndefinite() || b.isIndefinite())
-        return SMILTime::indefinite();
-    return a.value() - b.value();
-}
-
 SMILTime blink::operator*(const SMILTime& a,  const SMILTime& b)
 {
-    if (a.isUnresolved() || b.isUnresolved())
-        return SMILTime::unresolved();
-    if (!a.value() || !b.value())
+    // Equal operators have to be used instead of negation here to make NaN work as well.
+    if (a.value() == 0 || b.value() == 0)
         return SMILTime(0);
-    if (a.isIndefinite() || b.isIndefinite())
-        return SMILTime::indefinite();
     return a.value() * b.value();
 }