Do not use WebSandboxSupport when sandbox is disabled.

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 0a39a5613548885ef7cc9906d8f921a016118c6e..c9d6e412331a317c0060b013601065b36b647778 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -164,7 +164,7 @@ RendererWebKitPlatformSupportImpl::RendererWebKitPlatformSupportImpl()
       sudden_termination_disables_(0),
       plugin_refresh_allowed_(true),
       shared_worker_repository_(new WebSharedWorkerRepositoryImpl) {
-  if (g_sandbox_enabled) {
+  if (g_sandbox_enabled && sandboxEnabled()) {
     sandbox_support_.reset(
         new RendererWebKitPlatformSupportImpl::SandboxSupport);
   } else {