Sync our homegrown SysInfo replacement with the one in Chrome base.

src/base/platform/platform.h

Index: src/base/platform/platform.h
diff --git a/src/base/platform/platform.h b/src/base/platform/platform.h
index 8a5412626857af462184c0d916819ddfe4c3b9dd..9e20c084c6c7cc56be89a83d2fc348f428a08a0e 100644
--- a/src/base/platform/platform.h
+++ b/src/base/platform/platform.h
@@ -284,16 +284,6 @@ class OS {
   // using --never-compact) if accurate profiling is desired.
   static void SignalCodeMovingGC();
 
-  // Returns the number of processors online.
-  static int NumberOfProcessorsOnline();
-
-  // The total amount of physical memory available on the current system.
-  static uint64_t TotalPhysicalMemory();
-
-  // Maximum size of the virtual memory.  0 means there is no artificial
-  // limit.
-  static intptr_t MaxVirtualMemory();
-
   // Returns the double constant NAN
   static double nan_value();