Mojo: Make mojob build only mojo.

mojo/tools/mojob.sh

 #!/bin/bash
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This a simple script to make building/testing Mojo components easier (on
 # Linux).
 
 # TODO(vtl): Maybe make the test runner smart and not run unchanged test
 # binaries.
 # TODO(vtl) Maybe also provide a way to pass command-line arguments to the test
 # binaries.
 
 # We're in src/mojo/tools. We want to get to src.
 cd "$(realpath "$(dirname "$0")")/../.."
 
 build() {
-  ninja -C "out/$1" || exit 1
+  ninja -C "out/$1" mojo || exit 1
 }
 
 unittests() {
   "out/$1/mojo_system_unittests" || exit 1
   "out/$1/mojo_public_unittests" || exit 1
   "out/$1/mojo_bindings_test" || exit 1
 }
 
 perftests() {
   "out/$1/mojo_public_perftests" || exit 1
@@ skipping 78 matching lines @@
       # character.
       echo alias\ mojob\=\'\"\$\(pwd\ \|\ sed\ \'\"\'\"\'s\/\\\(\.\*\\\/src\\\)\
 \.\*\/\\1\/\'\"\'\"\'\)\/mojo\/tools\/mojob\.sh\"\'
       ;;
     *)
       echo "Unknown command \"${arg}\". Try \"$(basename "$0") help\"."
       exit 1
       ;;
   esac
 done