Revert of Replace IPC messages in layout_test_render_frame_observer.

content/shell/common/layout_test.mojom

-// Copyright 2017 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.
-
-module content.mojom;
-
-import "mojo/common/file_path.mojom";
-import "ui/gfx/geometry/mojo/geometry.mojom";
-import "url/mojo/url.mojom";
-
-struct ShellTestConfiguration {
-  // The current working directory.
-  mojo.common.mojom.FilePath current_working_directory;
-
-  // The temporary directory of the system.
-  mojo.common.mojom.FilePath temp_path;
-
-  // The URL of the current layout test.
-  url.mojom.Url test_url;
-
-  // True if pixel tests are enabled.
-  bool enable_pixel_dumping;
-
-  // True if tests can open external URLs
-  bool allow_external_pages;
-
-  // The expected MD5 hash of the pixel results.
-  string expected_pixel_hash;
-
-  // The initial size of the test window.
-  gfx.mojom.Size initial_size;
-};
-
-interface LayoutTestControl {
-  // Asks a frame to dump its contents into a string and send them back over
-  // IPC.
-  LayoutDumpRequest();
-
-  // Replicates test config (for an already started test) to a new renderer
-  // that hosts parts of the main test window.
-  ReplicateTestConfiguration(ShellTestConfiguration config);
-
-  // Sets the test config for a layout test that is being started.  This message
-  // is sent only to a renderer that hosts parts of the main test window.
-  SetTestConfiguration(ShellTestConfiguration config);
-
-  // Sets up a secondary renderer (renderer that doesn't [yet] host parts of the
-  // main test window) for a layout test.
-  SetupSecondaryRenderer();
-};