Replace image_messages.h with Mojo service

content/common/image_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 message file, no traditional include guard.
-#include <vector>
-
-#include "ipc/ipc_message.h"
-#include "ipc/ipc_message_macros.h"
-#include "ipc/ipc_param_traits.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "ui/gfx/geometry/size.h"
-
-#define IPC_MESSAGE_START ImageMsgStart
-
-// Messages sent from the browser to the renderer.
-
-// Requests the renderer to download the specified image, decode it,
-// and send the image data back via ImageHostMsg_DidDownloadImage.
-IPC_MESSAGE_ROUTED5(ImageMsg_DownloadImage,
-                    int /* Identifier for the request */,
-                    GURL /* URL of the image */,
-                    bool /* is favicon (turn off cookies) */,
-                    uint32_t /* Maximal bitmap size in pixel. The results are
-                                filtered according the max size. If there are no
-                                bitmaps at the passed in GURL <= max size, the
-                                smallest bitmap is resized to the max size and
-                                is the only result. A max size of zero means
-                                that the max size is unlimited. */,
-                    bool /* bypass cache */)
-
-// Messages sent from the renderer to the browser.
-
-IPC_MESSAGE_ROUTED5(ImageHostMsg_DidDownloadImage,
-                    int /* Identifier of the request */,
-                    int /* HTTP response status */,
-                    GURL /* URL of the image */,
-                    std::vector<SkBitmap> /* bitmap data */,
-                    /* The sizes in pixel of the bitmaps before they were
-                       resized due to the maximal bitmap size passed to
-                       ImageMsg_DownloadImage. Each entry in the bitmaps vector
-                       corresponds to an entry in the sizes vector. If a bitmap
-                       was resized, there should be a single returned bitmap. */
-                    std::vector<gfx::Size>)