Remove ImageDataFetcher from iOS.

ios/web/BUILD.gn

 # Copyright 2015 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.
 
 import("//ios/build/config.gni")
 import("//ios/web/js_compile.gni")
 import("//testing/test.gni")
 import("//tools/grit/grit_rule.gni")
 
 group("all_tests") {
@@ skipping 400 matching lines @@
     "public/test/fakes/test_web_state_delegate.h",
     "public/test/fakes/test_web_state_delegate.mm",
     "public/test/fakes/test_web_view_content_view.h",
     "public/test/fakes/test_web_view_content_view.mm",
     "public/test/http_server.h",
     "public/test/http_server.mm",
     "public/test/http_server_util.h",
     "public/test/http_server_util.mm",
     "public/test/js_test_util.h",
     "public/test/js_test_util.mm",
-    "public/test/mock_image_data_fetcher.h",
-    "public/test/mock_image_data_fetcher.mm",
     "public/test/native_controller_test_util.h",
     "public/test/native_controller_test_util.mm",
     "public/test/navigation_test_util.h",
     "public/test/navigation_test_util.mm",
     "public/test/response_providers/data_response_provider.h",
     "public/test/response_providers/data_response_provider.mm",
     "public/test/response_providers/delayed_response_provider.h",
     "public/test/response_providers/delayed_response_provider.mm",
     "public/test/response_providers/error_page_response_provider.h",
     "public/test/response_providers/error_page_response_provider.mm",
@@ skipping 232 matching lines @@
     "ios_web_resources.pak",
   ]
   grit_flags = [
     "-E",
     "root_gen_dir=" + rebase_path(root_gen_dir, root_build_dir),
   ]
   deps = [
     "//mojo/public/js:bindings",
   ]
 }