move favicon download code from chrome/ into content/

chrome/common/icon_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 "chrome/common/favicon_url.h"
-#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"
-
-#define IPC_MESSAGE_START IconMsgStart
-
-IPC_ENUM_TRAITS(FaviconURL::IconType)
-
-IPC_STRUCT_TRAITS_BEGIN(FaviconURL)
-  IPC_STRUCT_TRAITS_MEMBER(icon_url)
-  IPC_STRUCT_TRAITS_MEMBER(icon_type)
-IPC_STRUCT_TRAITS_END()
-
-// Messages sent from the browser to the renderer.
-
-// Requests the renderer to download the specified favicon image, decode it,
-// and send the image data back via IconHostMsg_DidDownloadFavicon.
-IPC_MESSAGE_ROUTED3(IconMsg_DownloadFavicon,
-                    int /* identifier for the request */,
-                    GURL /* URL of the image */,
-                    int /* Preferred favicon size. Passed on to
-                           IconHostMsg_DidDownloadFavicon, unused otherwise */)
-
-// Messages sent from the renderer to the browser.
-
-// Notification that the urls for the favicon of a site has been determined.
-IPC_MESSAGE_ROUTED2(IconHostMsg_UpdateFaviconURL,
-                    int32 /* page_id */,
-                    std::vector<FaviconURL> /* urls of the favicon */)
-
-IPC_MESSAGE_ROUTED5(IconHostMsg_DidDownloadFavicon,
-                    int /* Identifier of the request */,
-                    GURL /* URL of the image */,
-                    bool /* true if there was a network error */,
-                    int /* Preferred icon size passed to
-                           IconMsg_DownloadFavicon */,
-                    std::vector<SkBitmap> /* image_data */)