rlz: Hook up on mac, switch to chrome's network stack on win.

chrome/browser/browser_shutdown.cc

Index: chrome/browser/browser_shutdown.cc
diff --git a/chrome/browser/browser_shutdown.cc b/chrome/browser/browser_shutdown.cc
index daffffb7a35516f5d128c353391827b9fa956a23..ce92ae5ce65790b9339493095b4c6ef6947eeeab 100644
--- a/chrome/browser/browser_shutdown.cc
+++ b/chrome/browser/browser_shutdown.cc
@@ -42,6 +42,9 @@
 #if defined(OS_WIN)
 #include "chrome/browser/browser_util_win.h"
 #include "chrome/browser/first_run/upgrade_util_win.h"
+#endif
+
+#if defined(OS_WIN) || defined(OS_MACOSX)
 #include "chrome/browser/rlz/rlz.h"
 #endif
 
@@ -155,7 +158,7 @@ bool ShutdownPreThreadsStop() {
 
   prefs->CommitPendingWrite();
 
-#if defined(OS_WIN) && defined(GOOGLE_CHROME_BUILD)
+#if (defined(OS_WIN) || defined(OS_MACOSX)) && defined(GOOGLE_CHROME_BUILD)
   // Cleanup any statics created by RLZ. Must be done before NotificationService
   // is destroyed.
   RLZTracker::CleanupRlz();