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

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..0d7a47041632f98b9a971124752e87adefc9c36b 100644
--- a/extensions/renderer/user_script_injector.cc
+++ b/extensions/renderer/user_script_injector.cc
@@ -122,7 +122,7 @@ bool UserScriptInjector::ShouldInjectCss(
 }
 
 PermissionsData::AccessType UserScriptInjector::CanExecuteOnFrame(
-    const Extension* extension,
+    const Host* host,
     blink::WebFrame* web_frame,
     int tab_id,
     const GURL& top_url) const {
@@ -133,27 +133,8 @@ PermissionsData::AccessType UserScriptInjector::CanExecuteOnFrame(
 
   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
       web_frame, web_frame->document().url(), script_->match_about_blank());
-
-  // Declarative user scripts use "page access" (from "permissions" section in
-  // manifest) whereas non-declarative user scripts use custom
-  // "content script access" logic.
-  if (is_declarative_) {
-    return extension->permissions_data()->GetPageAccess(
-        extension,
-        effective_document_url,
-        top_url,
-        tab_id,
-        -1,  // no process id
-        NULL /* ignore error */);
-  } else {
-    return extension->permissions_data()->GetContentScriptAccess(
-        extension,
-        effective_document_url,
-        top_url,
-        tab_id,
-        -1,  // no process id
-        NULL /* ignore error */);
-  }
+  return host->CanExecuteOnFrame(
+      effective_document_url, top_url, tab_id, is_declarative_);
 }
 
 std::vector<blink::WebScriptSource> UserScriptInjector::GetJsSources(