Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/web_state_opener_unittest.mm

Index: ios/chrome/browser/web_state_list/web_state_opener_unittest.mm
diff --git a/ios/chrome/browser/web_state_list/web_state_opener_unittest.mm b/ios/chrome/browser/web_state_list/web_state_opener_unittest.mm
deleted file mode 100644
index bd8f21f2c752655b32f3ef72052135080e16b440..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/web_state_list/web_state_opener_unittest.mm
+++ /dev/null
@@ -1,76 +0,0 @@
-// 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/web_state_list/web_state_opener.h"
-
-#include <memory>
-
-#include "base/memory/ptr_util.h"
-#import "ios/web/public/test/fakes/test_navigation_manager.h"
-#import "ios/web/public/test/fakes/test_web_state.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "testing/platform_test.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-
-class FakeNavigationManager : public web::TestNavigationManager {
- public:
-  explicit FakeNavigationManager(int last_committed_item_index)
-      : last_committed_item_index_(last_committed_item_index) {}
-
-  // web::NavigationManager implementation.
-  int GetLastCommittedItemIndex() const override {
-    return last_committed_item_index_;
-  }
-
- private:
-  int last_committed_item_index_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeNavigationManager);
-};
-
-}  // namespace
-
-class WebStateOpenerTest : public PlatformTest {
- public:
-  WebStateOpenerTest() = default;
-
-  std::unique_ptr<web::WebState> CreateWebState(int last_committed_item_index) {
-    auto test_web_state = base::MakeUnique<web::TestWebState>();
-    test_web_state->SetNavigationManager(
-        base::MakeUnique<FakeNavigationManager>(last_committed_item_index));
-    // TODO(crbug.com/703565): remove std::move() once Xcode 9.0+ is required.
-    return std::move(test_web_state);
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WebStateOpenerTest);
-};
-
-TEST_F(WebStateOpenerTest, NullWebState) {
-  WebStateOpener opener(nullptr);
-
-  EXPECT_EQ(nullptr, opener.opener);
-  EXPECT_EQ(-1, opener.navigation_index);
-}
-
-TEST_F(WebStateOpenerTest, DefaultNavigationIndex) {
-  std::unique_ptr<web::WebState> web_state = CreateWebState(2);
-  WebStateOpener opener(web_state.get());
-
-  EXPECT_EQ(web_state.get(), opener.opener);
-  EXPECT_EQ(2, opener.navigation_index);
-}
-
-TEST_F(WebStateOpenerTest, ExplicitNavigationIndex) {
-  std::unique_ptr<web::WebState> web_state = CreateWebState(2);
-  WebStateOpener opener(web_state.get(), 1);
-
-  EXPECT_EQ(web_state.get(), opener.opener);
-  EXPECT_EQ(1, opener.navigation_index);
-}