Update from https://crrev.com/304715

net/filter/filter_unittest.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/io_buffer.h"
 #include "net/filter/filter.h"
 #include "net/filter/mock_filter_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 
 namespace {
 
 class PassThroughFilter : public Filter {
  public:
-  PassThroughFilter() {}
+  PassThroughFilter() : Filter(FILTER_TYPE_UNSUPPORTED) {}
 
   FilterStatus ReadFilteredData(char* dest_buffer, int* dest_len) override {
     return CopyOut(dest_buffer, dest_len);
   }
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughFilter);
 };
 
 }  // namespace
 
@@ skipping 411 matching lines @@
            amount_to_copy);
     filter1->FlushStreamBuffer(amount_to_copy);
     read_array_index += amount_to_copy;
   } while (true);
 
   EXPECT_EQ(read_array_index, input_array_size);
   EXPECT_EQ(compare_array_index, input_array_size);
 }
 
 }  // Namespace net