Add enableReferrers and enableHyperlinkAuditing to contentSettings.misc API.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index eddf5ae78f568e02ad397895ba8951ed95faffdf..050067b5e2b2e1a3afd9cab3680ab0a0fc47bd60 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/browser_process_sub_thread.h"
+#include "chrome/browser/prefs/pref_member.h"
 #include "chrome/common/net/predictor_common.h"
 #include "net/base/network_change_notifier.h"
 
@@ -181,6 +182,8 @@ class IOThread : public BrowserProcessSubThread {
   scoped_ptr<net::NetworkChangeNotifier::IPAddressObserver>
       network_change_observer_;
 
+  BooleanPrefMember system_enable_referrers_;
+
   // Store HTTP Auth-related policies in this thread.
   std::string auth_schemes_;
   bool negotiate_disable_cname_lookup_;