Clean up some unused methods from ApplicationManager

mojo/runner/switches.cc

Index: mojo/runner/switches.cc
diff --git a/mojo/runner/switches.cc b/mojo/runner/switches.cc
index 82c0105eb7855d86f7012701a8de17d58fa09c31..976ba4ad96949cb8dae1de70903ab5907dad5858 100644
--- a/mojo/runner/switches.cc
+++ b/mojo/runner/switches.cc
@@ -15,10 +15,6 @@ const char kChildProcess[] = "child-process";
 // text/html,mojo:html_viewer,application/bravo,https://abarth.com/bravo
 const char kContentHandlers[] = "content-handlers";
 
-// Used internally to delete a loaded application after we load it. Used for
-// transient applications. Not for user use.
-const char kDeleteAfterLoad[] = "delete-after-load";
-
 // Enables the sandbox on this process.
 const char kEnableSandbox[] = "enable-sandbox";