Replace misc. network stub flags with more flexible ones

chromeos/dbus/dbus_thread_manager.h

Index: chromeos/dbus/dbus_thread_manager.h
diff --git a/chromeos/dbus/dbus_thread_manager.h b/chromeos/dbus/dbus_thread_manager.h
index c36ddc3dfe87cc28470a83afd4b3cd2561cb852f..513a59fe7ec3e994f20e42b179c8c0c41c4e5279 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -94,10 +94,12 @@ class CHROMEOS_EXPORT DBusThreadManager {
   // Similar to Initialize(), but injects an alternative
   // DBusThreadManager using SetInstanceForTest first.  The injected
   // object will be owned by the internal pointer and deleted by
-  // Shutdown().
+  // Shutdown(). Does not create any Fake client implementations.
   static void InitializeForTesting(DBusThreadManager* dbus_thread_manager);
 
-  // Initialize with stub implementations for tests based on stubs.
+  // Initialize with stub implementations for tests, creating a complete set
+  // of fake/stub client implementations. Also initializes a default set of
+  // fake Shill devices and services, customizable with switches::kShillStub.
   static void InitializeWithStub();
 
   // Returns true if DBusThreadManager has been initialized. Call this to