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..bff0545b110103c71380ed9b4da80a0010c0e35d 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() /* owner_extension_id */,
               true /* listen_for_extension_system_loaded */),
       profile_(profile),
       extension_registry_observer_(this) {
@@ -47,6 +48,9 @@ const std::set<UserScript> SharedUserScriptMaster::GetScriptsMetadata(
        ++it) {
     UserScript script = *it;
     script.set_incognito_enabled(incognito_enabled);
+    ConsumerID consumer_id(EXTENSIONS, extension->id(), TAB,
+                           ConsumerID::kDefaultInstanceID);
+    script.set_consumer_id(consumer_id);
     script_set.insert(script);
   }