Fix Google Style

paddle/platform/place.cc

@@ -6,12 +6,12 @@ namespace platform {
 namespace detail {
 
 class PlacePrinter : public boost::static_visitor<> {
-public:
+ public:
   PlacePrinter(std::ostream &os) : os_(os) {}
   void operator()(const CpuPlace &) { os_ << "CpuPlace"; }
   void operator()(const GpuPlace &p) { os_ << "GpuPlace(" << p.device << ")"; }
 
-private:
+ private:
   std::ostream &os_;
 };