Revert 126020 - Experiment for updating the tcmalloc chromium branch to r144 (gperftools 2.0).

third_party/tcmalloc/chromium/src/base/sysinfo.cc

Index: third_party/tcmalloc/chromium/src/base/sysinfo.cc
===================================================================
--- third_party/tcmalloc/chromium/src/base/sysinfo.cc	(revision 126022)
+++ third_party/tcmalloc/chromium/src/base/sysinfo.cc	(working copy)
@@ -86,20 +86,12 @@
 // time, so prefer making the syscalls directly if we can.
 #ifdef HAVE_SYS_SYSCALL_H
 # include <sys/syscall.h>
-#endif
-#ifdef SYS_open   // solaris 11, at least sometimes, only defines SYS_openat
 # define safeopen(filename, mode)  syscall(SYS_open, filename, mode)
-#else
-# define safeopen(filename, mode)  open(filename, mode)
-#endif
-#ifdef SYS_read
 # define saferead(fd, buffer, size)  syscall(SYS_read, fd, buffer, size)
-#else
-# define saferead(fd, buffer, size)  read(fd, buffer, size)
-#endif
-#ifdef SYS_close
 # define safeclose(fd)  syscall(SYS_close, fd)
 #else
+# define safeopen(filename, mode)  open(filename, mode)
+# define saferead(fd, buffer, size)  read(fd, buffer, size)
 # define safeclose(fd)  close(fd)
 #endif