Add enableReferrers and enableHyperlinkAuditing to contentSettings.misc API.

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 110b966a27de0e3829b0c5bd9860b9c15589ab6e..cadacc4b1e243fec505bec839f901e7770bdc3a0 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -9,6 +9,7 @@
 #include "chrome/browser/extensions/extension_event_router_forwarder.h"
 #include "chrome/browser/extensions/extension_proxy_api.h"
 #include "chrome/browser/extensions/extension_webrequest_api.h"
+#include "chrome/browser/prefs/pref_member.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_request_headers.h"
 #include "net/url_request/url_request.h"
@@ -36,9 +37,11 @@ void ForwardProxyErrors(net::URLRequest* request,
 ChromeNetworkDelegate::ChromeNetworkDelegate(
     ExtensionEventRouterForwarder* event_router,
     ProfileId profile_id,
+    BooleanPrefMember* enable_referrers,
     ProtocolHandlerRegistry* protocol_handler_registry)
     : event_router_(event_router),
       profile_id_(profile_id),
+      enable_referrers_(enable_referrers),
       protocol_handler_registry_(protocol_handler_registry) {
   DCHECK(event_router);
 }
@@ -47,6 +50,8 @@ ChromeNetworkDelegate::~ChromeNetworkDelegate() {}
 
 int ChromeNetworkDelegate::OnBeforeURLRequest(
     net::URLRequest* request, net::CompletionCallback* callback) {
+  if (!enable_referrers_.get() || !enable_referrers_->GetValue())
+    request->set_referrer(std::string());
   return ExtensionWebRequestEventRouter::GetInstance()->OnBeforeRequest(
       profile_id_, event_router_.get(), request, callback);
 }