Mojo-ify ShellViewHostMsg_LayoutDumpResponse.

content/shell/common/shell_messages.h

 // Copyright (c) 2012 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.
 
 // Multiply-included file, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/values.h"
 #include "content/public/common/common_param_traits.h"
@@ skipping 33 matching lines @@
 // Notifies BlinkTestRunner that the layout dump has completed
 // (and that it can proceed with finishing up the test).
 IPC_MESSAGE_ROUTED1(ShellViewMsg_LayoutDumpCompleted,
                     std::string /* completed/stitched layout dump */)
 
 // Send a text dump of the WebContents to the render host.
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_TextDump,
                     std::string /* dump */)
 
 // Asks the browser process to perform a layout dump spanning all the
-// (potentially cross-process) frames.  This triggers multiple
-// ShellViewMsg_LayoutDumpRequest / ShellViewHostMsg_LayoutDumpResponse messages
-// and ends with sending of ShellViewMsg_LayoutDumpCompleted.
+// (potentially cross-process) frames.  This goes through multiple
+// LayoutTestControl.DumpFrameLayout calls and ends with sending of
+// ShellViewMsg_LayoutDumpCompleted.
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_InitiateLayoutDump)
 
-// Sends a layout dump of a frame (response to ShellViewMsg_LayoutDumpRequest).
-IPC_MESSAGE_ROUTED1(ShellViewHostMsg_LayoutDumpResponse, std::string /* dump */)
-
 // Send an image dump of the WebContents to the render host.
 IPC_MESSAGE_ROUTED2(ShellViewHostMsg_ImageDump,
                     std::string /* actual pixel hash */,
                     SkBitmap /* image */)
 
 // Send an audio dump to the render host.
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_AudioDump,
                     std::vector<unsigned char> /* audio data */)
 
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_TestFinished)
@@ skipping 35 matching lines @@
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_SetBluetoothManualChooser,
                     bool /* enable */)
 IPC_MESSAGE_ROUTED0(ShellViewHostMsg_GetBluetoothManualChooserEvents)
 IPC_MESSAGE_ROUTED1(ShellViewMsg_ReplyBluetoothManualChooserEvents,
                     std::vector<std::string> /* events */)
 IPC_MESSAGE_ROUTED2(ShellViewHostMsg_SendBluetoothManualChooserEvent,
                     std::string /* event */,
                     std::string /* argument */)
 IPC_MESSAGE_ROUTED1(ShellViewHostMsg_SetPopupBlockingEnabled,
                     bool /* block_popups */)