Remove net::Filter direct dependency on IsSupportedMimeType

net/base/network_delegate.cc

 // 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.
 
 #include "net/base/network_delegate.h"
 
 #include "base/logging.h"
 #include "base/profiler/scoped_tracker.h"
 #include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
@@ skipping 224 matching lines @@
     const GURL& referrer_url) const {
   DCHECK(CalledOnValidThread());
   // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "423948 NetworkDelegate::OnCancelURLRequestWithPolicy..."));
   return OnCancelURLRequestWithPolicyViolatingReferrerHeader(
       request, target_url, referrer_url);
 }
 
+bool NetworkDelegate::IsSupportedMimeType(const std::string& mime_type) const {
+  DCHECK(CalledOnValidThread());
+  return OnIsSupportedMimeType(mime_type);
+}
+
 }  // namespace net