Change mojo application name to {name}.mojo

examples/echo/BUILD.gn

Index: examples/echo/BUILD.gn
diff --git a/examples/echo/BUILD.gn b/examples/echo/BUILD.gn
index b78a4e86fc812adc06523652181bac05cb845dba..25b1bc4a2edb3a9bcedba72e3ca8629e1c561f81 100644
--- a/examples/echo/BUILD.gn
+++ b/examples/echo/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 group("echo") {
@@ -11,7 +12,7 @@ group("echo") {
   ]
 }
 
-shared_library("client") {
+mojo_binary_application("client") {
   output_name = "echo_client"
 
   deps = [
@@ -25,7 +26,7 @@ shared_library("client") {
   sources = [ "echo_client.cc" ]
 }
 
-shared_library("service") {
+mojo_binary_application("service") {
   output_name = "echo_service"
 
   deps = [