Move shell service to toplevel shell namespace

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index dfff4d06b74d048612cfce5614424b7fb9962a18..4398ba8aafd3b3cc0b934350421953ecf6cf3caa 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -58,7 +58,7 @@ namespace media {
 class CdmFactory;
 }
 
-namespace mojo {
+namespace shell {
 class ShellClient;
 }
 
@@ -651,7 +651,7 @@ class CONTENT_EXPORT ContentBrowserClient {
 
   using StaticMojoApplicationMap =
       std::map<std::string,
-               base::Callback<std::unique_ptr<mojo::ShellClient>()>>;
+               base::Callback<std::unique_ptr<shell::ShellClient>()>>;
 
   // Registers Mojo applications to be loaded in the browser process by the
   // browser's global Mojo shell.