Apply Referrer-Policy header when following redirects

chrome/browser/profiles/profile_io_data.cc

Index: chrome/browser/profiles/profile_io_data.cc
diff --git a/chrome/browser/profiles/profile_io_data.cc b/chrome/browser/profiles/profile_io_data.cc
index b320a33ef9bc85aa1c530410c0dbfba60615b137..395dfa2b218018b07752d4ff7059ac38d2f6be1a 100644
--- a/chrome/browser/profiles/profile_io_data.cc
+++ b/chrome/browser/profiles/profile_io_data.cc
@@ -80,6 +80,7 @@
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/resource_context.h"
+#include "content/public/common/content_switches.h"
 #include "net/base/keygen_handler.h"
 #include "net/cert/cert_verifier.h"
 #include "net/cert/ct_log_verifier.h"
@@ -1029,6 +1030,11 @@ void ProfileIOData::Init(
 
   main_request_context_->set_enable_brotli(io_thread_globals->enable_brotli);
 
+  // TODO(estark): Remove this once the Referrer-Policy header is no
+  // longer an experimental feature. https://crbug.com/619228
+  main_request_context_->set_enable_referrer_policy_header(

[jochen (gone - plz use gerrit), 2016/06/29 15:26:39]

can we just turn this unconditionally on in content_shell's
ShellURLRequestContextGetter::GetURLRequestContext ?

[estark, 2016/06/29 17:36:14]

Why unconditionally? Would you be okay if I did it only when
kEnableExperimentalWebPlatformFeatures is on?

[estark, 2016/06/29 17:45:10]

(I went ahead and did that, let me know if there's a reason we should do it
unconditionally instead.)

[jochen (gone - plz use gerrit), 2016/06/29 19:36:16]

It should be enabled for layout tests as they should run with all experimental
features enabled, however, layout tests don't specify that command line flag.

You could add a helper method to ShellURLRequestContextGetter and override it in
LayoutTestURLRequestContextGetter

[jochen (gone - plz use gerrit), 2016/06/29 19:36:16]

It should be enabled for layout tests as they should run with all experimental
features enabled, however, layout tests don't specify that command line flag.

You could add a helper method to ShellURLRequestContextGetter and override it in
LayoutTestURLRequestContextGetter

[jochen (gone - plz use gerrit), 2016/06/29 19:36:16]

It should be enabled for layout tests as they should run with all experimental
features enabled, however, layout tests don't specify that command line flag.

You could add a helper method to ShellURLRequestContextGetter and override it in
LayoutTestURLRequestContextGetter

[estark, 2016/06/29 20:09:08]

Ah ok I see, I did that and added a layout test so we know it's working.

+      command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures));
+
   std::unique_ptr<ChromeNetworkDelegate> network_delegate(
       new ChromeNetworkDelegate(
 #if defined(ENABLE_EXTENSIONS)