Shell: Remove various child process type stuff.

shell/app_child_process.h

Index: shell/app_child_process.h
diff --git a/shell/app_child_process.h b/shell/app_child_process.h
index 9f0a0711153dad8acf0f38801503baa1c47dfb00..a26632f9b78e9a5d524abc33760a1e369dd4cea0 100644
--- a/shell/app_child_process.h
+++ b/shell/app_child_process.h
@@ -11,8 +11,8 @@
 namespace mojo {
 namespace shell {
 
-// An implementation of |ChildProcess| for a |TYPE_APP| child process, which
-// runs a single app (loaded from the file system) on its main thread.
+// An implementation of |ChildProcess| for an app child process, which runs a
+// single app (loaded from the file system) on its main thread.
 class AppChildProcess : public ChildProcess {
  public:
   AppChildProcess();