[Extensions] Remove mechanism for non-generated schemas

extensions/shell/common/shell_extensions_client.cc

Index: extensions/shell/common/shell_extensions_client.cc
diff --git a/extensions/shell/common/shell_extensions_client.cc b/extensions/shell/common/shell_extensions_client.cc
index 7f495497fa1112faa08860c1240149377030017f..3b4df062e013e0d4718c4af24bc49a367ea44f30 100644
--- a/extensions/shell/common/shell_extensions_client.cc
+++ b/extensions/shell/common/shell_extensions_client.cc
@@ -172,10 +172,6 @@ base::StringPiece ShellExtensionsClient::GetAPISchema(
   return api::GeneratedSchemas::Get(name);
 }
 
-void ShellExtensionsClient::RegisterAPISchemaResources(
-    ExtensionAPI* api) const {
-}
-
 bool ShellExtensionsClient::ShouldSuppressFatalErrors() const {
   return true;
 }