[NGFragmentItem] Adapt LayoutInlineTest.RegionHitTest to NGFragmentItem

This patch changes |LayoutInlineTest.RegionHitTest| to check
having inline boxes instead of |HitTestCulledInline()| becuase
|NGFragmentItem| doesn't use |HitTestCulledInline()|.

Bug: 982194
Change-Id: Ib62395142113900a36d4451a7896e2191916ec11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108210Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751254}

third_party/blink/renderer/core/layout/layout_inline_test.cc

@@ -8,6 +8,7 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/blink/renderer/core/layout/layout_block_flow.h"
+#include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_cursor.h"
 #include "third_party/blink/renderer/core/testing/core_unit_test_helper.h"
 #include "third_party/blink/renderer/platform/runtime_enabled_features.h"
 #include "third_party/blink/renderer/platform/testing/runtime_enabled_features_test_helpers.h"
@@ -110,6 +111,14 @@ TEST_F(LayoutInlineTest, RegionHitTest) {
       ToLayoutInline(GetLayoutObjectByElementId("lotsOfBoxes"));
   ASSERT_TRUE(lots_of_boxes);
 
+  if (RuntimeEnabledFeatures::LayoutNGFragmentItemEnabled()) {
+    NGInlineCursor cursor;
+    cursor.MoveTo(*lots_of_boxes);
+    ASSERT_TRUE(cursor);
+    EXPECT_EQ(lots_of_boxes, cursor.Current().GetLayoutObject());
+    return;
+  }
+
   HitTestRequest hit_request(HitTestRequest::kTouchEvent |
                              HitTestRequest::kListBased);