Bug 818391 - Add std::abs(long long) for VC9 since it lacks this C++11 signature. r=mats,jlebar

xpcom/string/public/nsAlgorithm.h

@@ -42,6 +42,17 @@ NS_MAX( const T& a, const T& b )
     return a > b ? a : b;
   }
 
+#if defined(_MSC_VER) && (_MSC_VER < 1600)
+namespace std {
+inline
+long long
+abs( const long long& a )
+{
+  return a < 0 ? -a : a;
+}
+}
+#endif
+
 namespace mozilla {
 
 template <class T>