Add mojom module suffix in .mojom files for components/filesystem.

services/shell/shell.cc

Index: services/shell/shell.cc
diff --git a/services/shell/shell.cc b/services/shell/shell.cc
index 63b5df09b5f20301815b175c1a1acfaa662571f9..a5824f9d857c517488b87821293a50a7c645b2f4 100644
--- a/services/shell/shell.cc
+++ b/services/shell/shell.cc
@@ -548,7 +548,7 @@ void Shell::InitCatalog(mojom::ShellClientPtr catalog) {
   //             a bit of a chicken-and-egg problem.
   CapabilitySpec spec;
   Interfaces interfaces;
-  interfaces.insert("filesystem::Directory");
+  interfaces.insert("filesystem::mojom::Directory");
   spec.provided["app"] = interfaces;
   Instance* instance = CreateInstance(CreateShellIdentity(),
                                       CreateCatalogIdentity(),