Remove unused code

ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_unittest.mm

Index: ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_unittest.mm
diff --git a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_unittest.mm b/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_unittest.mm
deleted file mode 100644
index 9acfe5525a578d4ed9432fe68abdf2da1e58421e..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/content_suggestions/cells/content_suggestions_button_item_unittest.mm
+++ /dev/null
@@ -1,31 +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/ui/content_suggestions/cells/content_suggestions_button_item.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-
-// Tests that configureCell: set all the fields of the cell.
-TEST(ContentSuggestionsButtonItemTest, CellIsConfigured) {
-  NSString* title = @"testTitle";
-  NSString* subtitle = @"testSubtitle";
-  ContentSuggestionsButtonItem* item =
-      [[ContentSuggestionsButtonItem alloc] initWithType:0
-                                                   title:title
-                                                subtitle:subtitle];
-  ContentSuggestionsButtonCell* cell = [[[item cellClass] alloc] init];
-  EXPECT_EQ([ContentSuggestionsButtonCell class], [cell class]);
-
-  [item configureCell:cell];
-  EXPECT_EQ(title, [cell.titleButton titleForState:UIControlStateNormal]);
-  EXPECT_EQ(subtitle, cell.detailTextLabel.text);
-}
-
-}  // namespace