Linux: make current InitializeSandbox() private.

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 63f5273a34d444ff198e6d89e0dae77c9ae47baf..b583d0a125da1eeecdbc524875b3381fff515383 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -16,6 +16,7 @@
 #include "base/threading/platform_thread.h"
 #include "build/build_config.h"
 #include "content/common/gpu/gpu_config.h"
+#include "content/common/sandbox_linux.h"
 #include "content/gpu/gpu_child_thread.h"
 #include "content/gpu/gpu_info_collector.h"
 #include "content/gpu/gpu_process.h"
@@ -231,11 +232,14 @@ int GpuMain(const MainFunctionParams& parameters) {
 #endif
 
     if (do_init_sandbox) {
-      if (watchdog_thread.get())
+      if (watchdog_thread.get()) {
         watchdog_thread->Stop();
-      gpu_info.sandboxed = InitializeSandbox();
-      if (watchdog_thread.get())
+      }
+      gpu_info.sandboxed =
+          LinuxSandbox::InitializeSandbox(LinuxSandbox::SANDBOX_CONFIG_GPU);
+      if (watchdog_thread.get()) {
         watchdog_thread->Start();
+      }
     }
   }
 #endif