Linux: don't try and read shmmax in the sandbox.

chrome/browser/zygote_main_linux.cc

Index: chrome/browser/zygote_main_linux.cc
diff --git a/chrome/browser/zygote_main_linux.cc b/chrome/browser/zygote_main_linux.cc
index a163550287bea0cb17c23fc243fb93d51987749d..2df10299fc9b6954b6bda0abeeec66dd0e245b6f 100644
--- a/chrome/browser/zygote_main_linux.cc
+++ b/chrome/browser/zygote_main_linux.cc
@@ -16,6 +16,7 @@
 #include "base/global_descriptors_posix.h"
 #include "base/pickle.h"
 #include "base/rand_util.h"
+#include "base/sys_info.h"
 #include "base/unix_domain_socket_posix.h"
 
 #include "chrome/browser/zygote_host_linux.h"
@@ -310,6 +311,8 @@ static bool MaybeEnterChroot() {
     // files and cache the results or the descriptors.
     base::RandUint64();
 
+    base::SysInfo::MaxSharedMemorySize();
+
     // To make wcstombs/mbstowcs work in a renderer, setlocale() has to be
     // called before the sandbox is triggered. It's possible to avoid calling
     // setlocale() by pulling out the conversion between FilePath and