Revert of Use IOSImageDataFetcherWrapper for favicon

components/image_fetcher/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/request_metadata.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.response_code = 1;
-  lhs.response_code = 1;
 
   EXPECT_EQ(rhs, lhs);
 }
 
 TEST(RequestMetadataTest, NoEquality) {
   RequestMetadata rhs;
   RequestMetadata lhs;
   rhs.mime_type = "testMimeType";
-  lhs.mime_type = "testMimeType";
-  rhs.response_code = 1;
-  lhs.response_code = 1;
+  lhs.mime_type = "testOtherMimeType";
 
-  lhs.mime_type = "testOtherMimeType";
   EXPECT_NE(rhs, lhs);
-  lhs.mime_type = "testMimeType";
-
-  lhs.response_code = 2;
-  EXPECT_NE(rhs, lhs);
-  lhs.response_code = 1;
 }
 
 }  // namespace image_fetcher