[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index fe72e68e1699481aa805c5877ebd62c8502a4d6f..0907b3aa3560bf7fe74419ce1b450d79d4b11cd2 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -362,7 +362,8 @@ void WebViewGuest::DidInitialize(const base::DictionaryValue& create_params) {
 
   if (web_view_guest_delegate_)
     web_view_guest_delegate_->OnDidInitialize();
-  AttachWebViewHelpers(web_contents());
+  ExtensionsAPIClient::Get()->AttachWebContentsHelpers(web_contents());
+  web_view_permission_helper_.reset(new WebViewPermissionHelper(this));
 
   rules_registry_id_ = GetOrGenerateRulesRegistryID(
       owner_web_contents()->GetRenderProcessHost()->GetID(),
@@ -376,12 +377,6 @@ void WebViewGuest::DidInitialize(const base::DictionaryValue& create_params) {
   ApplyAttributes(create_params);
 }
 
-void WebViewGuest::AttachWebViewHelpers(WebContents* contents) {
-  if (web_view_guest_delegate_)
-    web_view_guest_delegate_->OnAttachWebViewHelpers(contents);
-  web_view_permission_helper_.reset(new WebViewPermissionHelper(this));
-}
-
 void WebViewGuest::ClearDataInternal(base::Time remove_since,
                                      uint32 removal_mask,
                                      const base::Closure& callback) {