Refactoring: de-couple Extensions from "script injection System" [render side] : 1

extensions/renderer/user_script_injector.h

Index: extensions/renderer/user_script_injector.h
diff --git a/extensions/renderer/user_script_injector.h b/extensions/renderer/user_script_injector.h
index 85e557891334fd5faa8392f4b7ceafd2ca5a1dbd..86d9e9fa86886404d1f2824b77f9f45178befd99 100644
--- a/extensions/renderer/user_script_injector.h
+++ b/extensions/renderer/user_script_injector.h
@@ -13,12 +13,13 @@
 #include "extensions/renderer/script_injection.h"
 #include "extensions/renderer/user_script_set.h"
 
+class InjectionHost;
+
 namespace blink {
 class WebFrame;
 }
 
 namespace extensions {
-class Extension;
 
 // A ScriptInjector for UserScripts.
 class UserScriptInjector : public ScriptInjector,
@@ -43,7 +44,7 @@ class UserScriptInjector : public ScriptInjector,
   bool ShouldInjectJs(UserScript::RunLocation run_location) const override;
   bool ShouldInjectCss(UserScript::RunLocation run_location) const override;
   PermissionsData::AccessType CanExecuteOnFrame(
-      const Extension* extension,
+      const InjectionHost* injection_host,
       blink::WebFrame* web_frame,
       int tab_id,
       const GURL& top_url) const override;