Revert of [ios] Switches ToolbarModelDelegateIOS to use WebStateList.

ios/chrome/browser/ui/browser_view_controller_unittest.mm

Index: ios/chrome/browser/ui/browser_view_controller_unittest.mm
diff --git a/ios/chrome/browser/ui/browser_view_controller_unittest.mm b/ios/chrome/browser/ui/browser_view_controller_unittest.mm
index a22d722fc835546d7ef64ab6455736a798aa4510..65003711fffb8c2768d6848b40b23e71d7eb6150 100644
--- a/ios/chrome/browser/ui/browser_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/browser_view_controller_unittest.mm
@@ -48,8 +48,6 @@
 #include "ios/chrome/test/block_cleanup_test.h"
 #include "ios/chrome/test/ios_chrome_scoped_testing_local_state.h"
 #include "ios/chrome/test/testing_application_context.h"
-#include "ios/shared/chrome/browser/tabs/fake_web_state_list_delegate.h"
-#include "ios/shared/chrome/browser/tabs/web_state_list.h"
 #import "ios/testing/ocmock_complex_type_helper.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/test/test_web_thread_bundle.h"
@@ -115,30 +113,6 @@
 }
 @end
 
-@interface BVCTestTabModel : OCMockComplexTypeHelper
-- (instancetype)init NS_DESIGNATED_INITIALIZER;
-@end
-
-@implementation BVCTestTabModel {
-  FakeWebStateListDelegate _webStateListDelegate;
-  std::unique_ptr<WebStateList> _webStateList;
-}
-
-- (instancetype)init {
-  if ((self = [super
-           initWithRepresentedObject:[OCMockObject
-                                         niceMockForClass:[TabModel class]]])) {
-    _webStateList = base::MakeUnique<WebStateList>(&_webStateListDelegate,
-                                                   WebStateList::WebStateOwned);
-  }
-  return self;
-}
-
-- (WebStateList*)webStateList {
-  return _webStateList.get();
-}
-@end
-
 #pragma mark -
 
 namespace {
@@ -172,7 +146,7 @@
     bookmarks::test::WaitForBookmarkModelToLoad(bookmark_model);
 
     // Set up mock TabModel, Tab, and CRWWebController.
-    base::scoped_nsobject<id> tabModel([[BVCTestTabModel alloc] init]);
+    id tabModel = [OCMockObject mockForClass:[TabModel class]];
     base::scoped_nsobject<id> currentTab([[BVCTestTabMock alloc]
         initWithRepresentedObject:[OCMockObject niceMockForClass:[Tab class]]]);
     id webControllerMock =