Include mojo_main_{chromium,standalone}.cc instead of using a target

mojo/public/cpp/application/application.h

Index: mojo/public/cpp/application/application.h
diff --git a/mojo/public/cpp/application/application.h b/mojo/public/cpp/application/application.h
index a81aed5b4a82b8799db1d9f3932ea20d45ed1899..9a36e8367056e9e776ed90b3f99ccac22e0ce839 100644
--- a/mojo/public/cpp/application/application.h
+++ b/mojo/public/cpp/application/application.h
@@ -21,8 +21,8 @@
 #define APPLICATION_EXPORT __attribute__((visibility("default")))
 #endif
 
-// DSOs can either implement MojoMain directly or utilize the
-// mojo_main_{standalone|chromium} gyp targets and implement
+// DSOs can either implement MojoMain directly or include
+// mojo_main_{standalone|chromium}.cc in their project and implement
 // Application::Create();
 // TODO(davemoore): Establish this as part of our SDK for third party mojo
 // application writers.