Shell: Remove various child process type stuff.

shell/child_process.h

Index: shell/child_process.h
diff --git a/shell/child_process.h b/shell/child_process.h
index fc664bf616d7e2908995fafd60e76a9a85796f96..3da1c8fa2e89d495cd8a6f9188ac368b0ec98a0a 100644
--- a/shell/child_process.h
+++ b/shell/child_process.h
@@ -20,11 +20,6 @@ namespace shell {
 // the child process. (Instances are manufactured by |Create()|.)
 class ChildProcess {
  public:
-  enum Type {
-    // Hosts a single app (see app_child_process(_host).*).
-    TYPE_APP
-  };
-
   virtual ~ChildProcess();
 
   // Returns null if the command line doesn't indicate that this is a child