Remove net::Filter direct dependency on IsSupportedMimeType

net/base/layered_network_delegate.cc

 // Copyright 2014 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.
 
 #include "net/base/layered_network_delegate.h"
 
 namespace net {
 
 LayeredNetworkDelegate::LayeredNetworkDelegate(
     scoped_ptr<NetworkDelegate> nested_network_delegate)
@@ skipping 253 matching lines @@
                                                           referrer_url);
 }
 
 void LayeredNetworkDelegate::
     OnCancelURLRequestWithPolicyViolatingReferrerHeaderInternal(
         const URLRequest& request,
         const GURL& target_url,
         const GURL& referrer_url) const {
 }
 
+bool LayeredNetworkDelegate::OnIsSupportedMimeType(
+    const std::string& mime_type) const {
+  return nested_network_delegate_->IsSupportedMimeType(mime_type);
+}
+
 }  // namespace net