Remove obsolete code in TabModelOrderController.

ios/chrome/browser/tabs/tab_model_unittest.mm

 // Copyright 2012 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 <objc/runtime.h>
 
 #include "base/files/file_path.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
@@ skipping 438 matching lines @@
 
 TEST_F(TabModelTest, OpenerOfTabEmptyModel) {
   EXPECT_FALSE([tab_model_ openerOfTab:nil]);
 }
 
 TEST_F(TabModelTest, OpenersEmptyModel) {
   // Empty model.
   EXPECT_TRUE([tab_model_ isEmpty]);
   EXPECT_FALSE([tab_model_ nextTabWithOpener:nil afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:nil]);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:nil]);
 }
 
 TEST_F(TabModelTest, OpenersNothingOpenedGeneral) {
   // Start with a few tabs.
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
 
   Tab* tab = [tab_model_ insertTabWithWebState:CreateWebState(@"window")
                                        atIndex:[tab_model_ count]];
 
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
 
   // All should fail since this hasn't opened anything else.
   EXPECT_FALSE([tab_model_ nextTabWithOpener:tab afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:tab]);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:tab]);
 
   // Add more items to the tab, expect the same results.
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   EXPECT_FALSE([tab_model_ nextTabWithOpener:tab afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:tab]);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:tab]);
 }
 
 TEST_F(TabModelTest, OpenersNothingOpenedFirst) {
   // Our tab is first.
   Tab* tab = [tab_model_ insertTabWithWebState:CreateWebState(@"window")
                                        atIndex:[tab_model_ count]];
 
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
 
   // All should fail since this hasn't opened anything else.
   EXPECT_FALSE([tab_model_ nextTabWithOpener:tab afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:tab]);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:tab]);
 }
 
 TEST_F(TabModelTest, OpenersNothingOpenedLast) {
   // Our tab is last.
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   Tab* tab = [tab_model_ insertTabWithWebState:CreateWebState(@"window")
                                        atIndex:[tab_model_ count]];
 
   // All should fail since this hasn't opened anything else.
   EXPECT_FALSE([tab_model_ nextTabWithOpener:tab afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:tab]);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:tab]);
 }
 
 TEST_F(TabModelTest, OpenersChildTabBeforeOpener) {
   Tab* parent_tab = [tab_model_ insertTabWithWebState:CreateWebState(@"window")
                                               atIndex:[tab_model_ count]];
   // Insert child at start
-  Tab* child_tab =
-      [tab_model_ insertTabWithWebState:CreateChildWebState(parent_tab)
-                                atIndex:0];
+  [tab_model_ insertTabWithWebState:CreateChildWebState(parent_tab) atIndex:0];
 
   // Insert a few more between them.
   [tab_model_ insertTabWithWebState:CreateWebState(@"window") atIndex:1];
   [tab_model_ insertTabWithWebState:CreateWebState(@"window") atIndex:1];
 
   EXPECT_FALSE([tab_model_ nextTabWithOpener:parent_tab afterTab:nil]);
   EXPECT_FALSE([tab_model_ lastTabWithOpener:parent_tab]);
-  EXPECT_EQ([tab_model_ firstTabWithOpener:parent_tab], child_tab);
 }
 
 TEST_F(TabModelTest, OpenersChildTabAfterOpener) {
   Tab* parent_tab = [tab_model_ insertTabWithWebState:CreateWebState(@"window")
                                               atIndex:[tab_model_ count]];
 
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   // Insert two children at end.
   Tab* child_tab1 =
       [tab_model_ insertTabWithWebState:CreateChildWebState(parent_tab)
                                 atIndex:[tab_model_ count]];
   Tab* child_tab2 =
       [tab_model_ insertTabWithWebState:CreateChildWebState(parent_tab)
                                 atIndex:[tab_model_ count]];
 
   EXPECT_EQ([tab_model_ nextTabWithOpener:parent_tab afterTab:nil], child_tab1);
   EXPECT_EQ([tab_model_ nextTabWithOpener:parent_tab afterTab:child_tab1],
             child_tab2);
   EXPECT_EQ([tab_model_ lastTabWithOpener:parent_tab], child_tab2);
-  EXPECT_FALSE([tab_model_ firstTabWithOpener:parent_tab]);
 }
 
 TEST_F(TabModelTest, AddWithOrderController) {
   // Create a few tabs with the controller at the front.
   Tab* parent =
       [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
   [tab_model_ addTabWithURL:kURL referrer:kEmptyReferrer windowName:nil];
 
   // Add a new tab, it should be added behind the parent.
@@ skipping 323 matching lines @@
   // Restoring TabModel session sends asynchronous tasks to IO thread, wait
   // for them to complete after destroying the TabModel.
   base::RunLoop().RunUntilIdle();
 
   // Clean up.
   EXPECT_TRUE([[NSFileManager defaultManager] removeItemAtPath:stashPath
                                                          error:nullptr]);
 }
 
 }  // anonymous namespace