Remove duplicate application cpp files in mojo/application.

mojo/application/public/cpp/application_test_base.h

 // Copyright 2014 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.
 
 #ifndef MOJO_APPLICATION_PUBLIC_CPP_APPLICATION_TEST_BASE_H_
 #define MOJO_APPLICATION_PUBLIC_CPP_APPLICATION_TEST_BASE_H_
 
 #include "mojo/application/public/cpp/application_delegate.h"
 #include "mojo/application/public/interfaces/application.mojom.h"
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 
 class ApplicationImpl;
 
 namespace test {
 
-// Access the command line arguments passed to the application test.
-const Array<String>& Args();
-
 // Run all application tests. This must be called after the environment is
 // initialized, to support construction of a default run loop.
 MojoResult RunAllTests(MojoHandle application_request_handle);
 
 // A GTEST base class for application testing executed in mojo_shell.
 class ApplicationTestBase : public testing::Test {
  public:
   ApplicationTestBase();
   ~ApplicationTestBase() override;
 
@@ skipping 19 matching lines @@
   ApplicationDelegate default_application_delegate_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ApplicationTestBase);
 };
 
 }  // namespace test
 
 }  // namespace mojo
 
 #endif  // MOJO_APPLICATION_PUBLIC_CPP_APPLICATION_TEST_BASE_H_