AdjustRendererOOMScore isn't execute in linux.

content/browser/zygote_host/zygote_host_impl_linux.cc

Index: content/browser/zygote_host/zygote_host_impl_linux.cc
diff --git a/content/browser/zygote_host/zygote_host_impl_linux.cc b/content/browser/zygote_host/zygote_host_impl_linux.cc
index a3e8e611d3728e8714fe375429fbf04542849c73..435645e8d396664c593d9ace14e4df8f91bd4489 100644
--- a/content/browser/zygote_host/zygote_host_impl_linux.cc
+++ b/content/browser/zygote_host/zygote_host_impl_linux.cc
@@ -433,7 +433,9 @@ void ZygoteHostImpl::AdjustRendererOOMScore(base::ProcessHandle pid,
     adj_oom_score_cmdline.push_back(base::IntToString(score));
 
     base::ProcessHandle sandbox_helper_process;
-    if (base::LaunchProcess(adj_oom_score_cmdline, base::LaunchOptions(),
+    base::LaunchOptions options;
+    options.allow_new_privs = true;

[jln (very slow on Chromium), 2014/04/24 00:17:59]

Please add a comment along the lines of "sandbox_helper_process is a setuid
binary".

+    if (base::LaunchProcess(adj_oom_score_cmdline, options,
                             &sandbox_helper_process)) {
       base::EnsureProcessGetsReaped(sandbox_helper_process);
     }
@@ -505,6 +507,10 @@ base::TerminationStatus ZygoteHostImpl::GetTerminationStatus(
   return static_cast<base::TerminationStatus>(status);
 }
 
+bool ZygoteHostImpl::UsingSUIDSandbox() const {
+  return using_suid_sandbox_;
+}
+
 pid_t ZygoteHostImpl::GetPid() const {
   return pid_;
 }