Expose the sandbox related code through the content API. I did a bit of cleanup while I was doing...

base/message_pump_libevent.cc

Index: base/message_pump_libevent.cc
===================================================================
--- base/message_pump_libevent.cc	(revision 107845)
+++ base/message_pump_libevent.cc	(working copy)
@@ -11,7 +11,6 @@
 #include "base/compiler_specific.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
-#include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/time.h"
@@ -21,6 +20,10 @@
 #include "third_party/libevent/event.h"
 #endif
 
+#if defined(OS_MACOSX)
+#include "base/mac/scoped_nsautorelease_pool.h"
+#endif
+
 // Lifecycle of struct event
 // Libevent uses two main data structures:
 // struct event_base (of which there is one per message pump), and
@@ -228,7 +231,9 @@
   scoped_ptr<event> timer_event(new event);
 
   for (;;) {
+#if defined(OS_MACOSX)
     mac::ScopedNSAutoreleasePool autorelease_pool;
+#endif
 
     bool did_work = delegate->DoWork();
     if (!keep_running_)