Fix Notifications Icon loading.

content/common/icon_messages.h

Index: content/common/icon_messages.h
diff --git a/content/common/icon_messages.h b/content/common/icon_messages.h
index 9c466431991bce69c4531c90a21c586db11aa23e..d82850133a28879fffd4ad670f12e2d038e2b17a 100644
--- a/content/common/icon_messages.h
+++ b/content/common/icon_messages.h
@@ -5,6 +5,7 @@
 // Multiply-included message file, no traditional include guard.
 #include <vector>
 
+#include "content/public/common/content_constants.h"
 #include "content/public/common/favicon_url.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
@@ -14,6 +15,7 @@
 #define IPC_MESSAGE_START IconMsgStart
 
 IPC_ENUM_TRAITS(content::FaviconURL::IconType)
+IPC_ENUM_TRAITS(content::DownloadImageType)
 
 IPC_STRUCT_TRAITS_BEGIN(content::FaviconURL)
   IPC_STRUCT_TRAITS_MEMBER(icon_url)
@@ -24,9 +26,10 @@ IPC_STRUCT_TRAITS_END()
 
 // 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,
+IPC_MESSAGE_ROUTED4(IconMsg_DownloadFavicon,
                     int /* identifier for the request */,
                     GURL /* URL of the image */,
+                    content::DownloadImageType /* type of image */,
                     int /* Preferred favicon size. Passed on to
                            IconHostMsg_DidDownloadFavicon, unused otherwise */)