[ImageFetcher] Return http response headers

components/image_fetcher/core/request_metadata_unittest.cc

 // Copyright 2017 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 "components/image_fetcher/core/request_metadata.h"
 
+#include "base/memory/ref_counted.h"
+#include "net/http/http_response_headers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace image_fetcher {
 
 TEST(RequestMetadataTest, Equality) {
   RequestMetadata rhs;
   RequestMetadata lhs;
   rhs.mime_type = "testMimeType";
   lhs.mime_type = "testMimeType";
   rhs.http_response_code = 1;
@@ skipping 21 matching lines @@
   lhs.http_response_code = 2;
   EXPECT_NE(rhs, lhs);
   lhs.http_response_code = 1;
 
   lhs.from_http_cache = false;
   EXPECT_NE(rhs, lhs);
   lhs.from_http_cache = true;
 }
 
 }  // namespace image_fetcher