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

extensions/renderer/user_script_injector.cc

Index: extensions/renderer/user_script_injector.cc
diff --git a/extensions/renderer/user_script_injector.cc b/extensions/renderer/user_script_injector.cc
index 73ac9f60a839a44787e079db87d84a7847e8bf24..f275c8e2703dbad8e2526e49f8421a3d31f8bfdd 100644
--- a/extensions/renderer/user_script_injector.cc
+++ b/extensions/renderer/user_script_injector.cc
@@ -54,13 +54,12 @@ base::LazyInstance<GreasemonkeyApiJsString> g_greasemonkey_api =
 
 }  // namespace
 
-UserScriptInjector::UserScriptInjector(
-    const UserScript* script,
-    UserScriptSet* script_list,
-    bool is_declarative)
+UserScriptInjector::UserScriptInjector(const UserScript* script,
+                                       UserScriptSet* script_list,
+                                       bool is_declarative)
     : script_(script),
       script_id_(script_->id()),
-      extension_id_(script_->extension_id()),
+      extension_id_(script_->GetExtensionID()),
       is_declarative_(is_declarative),
       user_script_set_observer_(this) {
   user_script_set_observer_.Add(script_list);