remote_suggestions_provider_impl_unittest.cc: Remove unused code

components/ntp_snippets/remote/remote_suggestions_provider_impl_unittest.cc

 // 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.
 
 #include "components/ntp_snippets/remote/remote_suggestions_provider_impl.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 71 matching lines @@
 namespace {
 
 MATCHER_P(IdEq, value, "") {
   return arg->id() == value;
 }
 
 MATCHER_P(IdWithinCategoryEq, expected_id, "") {
   return arg.id().id_within_category() == expected_id;
 }
 
-MATCHER_P(IsCategory, id, "") {
-  return arg.id() == static_cast<int>(id);
-}
-
 MATCHER_P(HasCode, code, "") {
   return arg.code == code;
 }
 
 const base::Time::Exploded kDefaultCreationTime = {2015, 11, 4, 25, 13, 46, 45};
 const char kTestContentSuggestionsServerEndpoint[] =
     "https://alpha-chromecontentsuggestions-pa.sandbox.googleapis.com/v1/"
     "suggestions/fetch";
 const char kAPIKey[] = "fakeAPIkey";
 const char kTestContentSuggestionsServerWithAPIKey[] =
@@ skipping 1706 matching lines @@
   WaitForSuggestionsProviderInitialization(service.get(),
                                            /*set_empty_response=*/true);
 
   // The scheduler should be notified of clearing the history.
   EXPECT_CALL(*scheduler(), OnSuggestionsCleared());
   service->OnStatusChanged(RemoteSuggestionsStatus::ENABLED_AND_SIGNED_OUT,
                            RemoteSuggestionsStatus::ENABLED_AND_SIGNED_IN);
 }
 
 }  // namespace ntp_snippets