Send an image-like 'Accept' header for favicons.

content/browser/loader/mime_sniffing_resource_handler.cc

Index: content/browser/loader/mime_sniffing_resource_handler.cc
diff --git a/content/browser/loader/mime_sniffing_resource_handler.cc b/content/browser/loader/mime_sniffing_resource_handler.cc
index 6813f3e8ea5a1554e83a79fb38287c17a26b998f..143bd4615e035b4a58d5c2034933bcb7ea24e528 100644
--- a/content/browser/loader/mime_sniffing_resource_handler.cc
+++ b/content/browser/loader/mime_sniffing_resource_handler.cc
@@ -106,6 +106,7 @@ bool MimeSniffingResourceHandler::OnWillStart(const GURL& url, bool* defer) {
     case RESOURCE_TYPE_STYLESHEET:
       accept_value = kStylesheetAcceptHeader;
       break;
+    case RESOURCE_TYPE_FAVICON:
     case RESOURCE_TYPE_IMAGE:
       accept_value = kImageAcceptHeader;
       break;
@@ -117,7 +118,6 @@ bool MimeSniffingResourceHandler::OnWillStart(const GURL& url, bool* defer) {
     case RESOURCE_TYPE_WORKER:
     case RESOURCE_TYPE_SHARED_WORKER:
     case RESOURCE_TYPE_PREFETCH:
-    case RESOURCE_TYPE_FAVICON:
     case RESOURCE_TYPE_XHR:
     case RESOURCE_TYPE_PING:
     case RESOURCE_TYPE_SERVICE_WORKER: