Move ContentSuggestions identifiers to custom target

ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier_unittest.mm

-// 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.
-
-#import "ios/chrome/browser/ui/content_suggestions/content_suggestion_identifier.h"
-
-#import "ios/chrome/browser/ui/content_suggestions/content_suggestions_section_information.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@interface ContentSuggestionIdentifierSubclassTest : ContentSuggestionIdentifier
-@end
-
-@implementation ContentSuggestionIdentifierSubclassTest
-@end
-
-// Tests different equality scenario.
-TEST(ContentSuggestionIdentifierTest, IsEquals) {
-  // Setup.
-  std::string id1("identifier");
-  std::string id2("identifier");
-  ContentSuggestionsSectionInformation* sectionInfo =
-      [[ContentSuggestionsSectionInformation alloc]
-          initWithSectionID:ContentSuggestionsSectionArticles];
-
-  ContentSuggestionIdentifier* suggestionIdentifier1 =
-      [[ContentSuggestionIdentifier alloc] init];
-  suggestionIdentifier1.sectionInfo = sectionInfo;
-  suggestionIdentifier1.IDInSection = id1;
-
-  ContentSuggestionIdentifier* suggestionIdentifier2 =
-      [[ContentSuggestionIdentifier alloc] init];
-  suggestionIdentifier2.sectionInfo = sectionInfo;
-  suggestionIdentifier2.IDInSection = id2;
-
-  ContentSuggestionIdentifierSubclassTest* subclass =
-      [[ContentSuggestionIdentifierSubclassTest alloc] init];
-  subclass.sectionInfo = sectionInfo;
-  subclass.IDInSection = id2;
-
-  // Action and Test.
-  EXPECT_TRUE([suggestionIdentifier1 isEqual:suggestionIdentifier2]);
-  EXPECT_TRUE([suggestionIdentifier1 isEqual:suggestionIdentifier1]);
-  EXPECT_TRUE([suggestionIdentifier1 isEqual:subclass]);
-}
-
-// Test non-equality between different objects.
-TEST(ContentSuggestionIdentifierTest, IsNotEqualsDifferentObjects) {
-  // Setup.
-  NSObject* object = [[NSObject alloc] init];
-  ContentSuggestionIdentifier* suggestionIdentifier =
-      [[ContentSuggestionIdentifier alloc] init];
-
-  // Action and Test.
-  EXPECT_FALSE([suggestionIdentifier isEqual:object]);
-}
-
-// Test non-equality.
-TEST(ContentSuggestionIdentifierTest, IsNotEquals) {
-  // Setup.
-  std::string id1("identifier");
-  std::string id2("identifier2");
-  ContentSuggestionsSectionInformation* sectionInfo1 =
-      [[ContentSuggestionsSectionInformation alloc]
-          initWithSectionID:ContentSuggestionsSectionArticles];
-  ContentSuggestionsSectionInformation* sectionInfo2 =
-      [[ContentSuggestionsSectionInformation alloc]
-          initWithSectionID:ContentSuggestionsSectionBookmarks];
-
-  ContentSuggestionIdentifier* suggestionIdentifier1 =
-      [[ContentSuggestionIdentifier alloc] init];
-  suggestionIdentifier1.sectionInfo = sectionInfo1;
-  suggestionIdentifier1.IDInSection = id1;
-
-  ContentSuggestionIdentifier* suggestionIdentifier2 =
-      [[ContentSuggestionIdentifier alloc] init];
-  suggestionIdentifier2.sectionInfo = sectionInfo1;
-  suggestionIdentifier2.IDInSection = id2;
-
-  ContentSuggestionIdentifier* suggestionIdentifier3 =
-      [[ContentSuggestionIdentifier alloc] init];
-  suggestionIdentifier3.sectionInfo = sectionInfo2;
-  suggestionIdentifier3.IDInSection = id1;
-
-  // Action and Test.
-  EXPECT_FALSE([suggestionIdentifier1 isEqual:suggestionIdentifier2]);
-  EXPECT_FALSE([suggestionIdentifier2 isEqual:suggestionIdentifier3]);
-  EXPECT_FALSE([suggestionIdentifier1 isEqual:suggestionIdentifier3]);
-}