[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/api/extensions_api_client.cc

Index: extensions/browser/api/extensions_api_client.cc
diff --git a/extensions/browser/api/extensions_api_client.cc b/extensions/browser/api/extensions_api_client.cc
index adf9090ba77c7a68ddc1b1f4b407e772f54213d0..5fc571c0ae84b749e858cc387d6958501b26377b 100644
--- a/extensions/browser/api/extensions_api_client.cc
+++ b/extensions/browser/api/extensions_api_client.cc
@@ -33,6 +33,10 @@ void ExtensionsAPIClient::AddAdditionalValueStoreCaches(
     std::map<settings_namespace::Namespace, ValueStoreCache*>* caches) {
 }
 
+void ExtensionsAPIClient::AttachWebContentsHelpers(
+    content::WebContents* web_contents) const {
+}
+
 AppViewGuestDelegate* ExtensionsAPIClient::CreateAppViewGuestDelegate() const {
   return NULL;
 }
@@ -43,12 +47,6 @@ ExtensionsAPIClient::CreateExtensionOptionsGuestDelegate(
   return NULL;
 }
 
-ExtensionViewGuestDelegate*
-ExtensionsAPIClient::CreateExtensionViewGuestDelegate(
-    ExtensionViewGuest* guest) const {
-  return NULL;
-}
-
 scoped_ptr<MimeHandlerViewGuestDelegate>
 ExtensionsAPIClient::CreateMimeHandlerViewGuestDelegate(
     MimeHandlerViewGuest* guest) const {