Introduce HostID and de-couple Extensions from "script injection System" [browser side]

chrome/browser/extensions/shared_user_script_master.cc

Index: chrome/browser/extensions/shared_user_script_master.cc
diff --git a/chrome/browser/extensions/shared_user_script_master.cc b/chrome/browser/extensions/shared_user_script_master.cc
index 803ba0682545651b5075591cd338f3a828795cc5..aaa52fa336210207e55303a834f8ab444e66a81c 100644
--- a/chrome/browser/extensions/shared_user_script_master.cc
+++ b/chrome/browser/extensions/shared_user_script_master.cc
@@ -8,12 +8,13 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
 #include "extensions/browser/extension_registry.h"
+#include "extensions/common/consumer.h"
 
 namespace extensions {
 
 SharedUserScriptMaster::SharedUserScriptMaster(Profile* profile)
     : loader_(profile,
-              std::string() /* owner_extension_id */,
+              ConsumerID::EmptyConsumerID() /* owner_extension_id */,
               true /* listen_for_extension_system_loaded */),
       profile_(profile),
       extension_registry_observer_(this) {