Remove empty line to make it clean.

Author: GoeLin

src/hotspot/os/linux/os_linux.hpp

@@ -104,8 +104,6 @@ class Linux {
     bool     has_steal_ticks;
   };
 
-  static int active_processor_count();
-
   // which_logical_cpu=-1 returns accumulated ticks for all cpus.
   static bool get_tick_information(CPUPerfTicks* pticks, int which_logical_cpu);
   static bool _stack_is_executable;