Get rid of {Run,Terminate}MainApplication(), and more ApplicationDelegate conversion.

examples/bank_app/bank.cc

Index: examples/bank_app/bank.cc
diff --git a/examples/bank_app/bank.cc b/examples/bank_app/bank.cc
index dec7814027344bf1ba864d5d56784cd374f987c4..dca5fc8ee0ad17dfc0e5829b757a0da43751b0de 100644
--- a/examples/bank_app/bank.cc
+++ b/examples/bank_app/bank.cc
@@ -91,5 +91,5 @@ class BankApp : public mojo::ApplicationImplBase {
 
 MojoResult MojoMain(MojoHandle application_request) {
   examples::BankApp bank_app;
-  return mojo::RunMainApplication(application_request, &bank_app);
+  return mojo::RunApplication(application_request, &bank_app);
 }