Simplify mojo_shell since it's now only used for Mandoline.

mojo/application/application_runner_chromium.h

Index: mojo/application/application_runner_chromium.h
diff --git a/mojo/application/application_runner_chromium.h b/mojo/application/application_runner_chromium.h
index cb586850a5e0539d48a29185170528374822e32c..2d6d91067a14e10840ba36bbf82d9de5ee015dbb 100644
--- a/mojo/application/application_runner_chromium.h
+++ b/mojo/application/application_runner_chromium.h
@@ -30,6 +30,8 @@ class ApplicationRunnerChromium {
   explicit ApplicationRunnerChromium(ApplicationDelegate* delegate);
   ~ApplicationRunnerChromium();
 
+  static void InitBaseCommandLine();
+
   void set_message_loop_type(base::MessageLoop::Type type);
 
   // Once the various parameters have been set above, use Run to initialize an