Remove unused DocumentMarkerController::HasMarkers()

HasMarkers and its caller InlineTextBoxPainter::PaintsMarkerHighlights is
not called anywhere. Remove them.

Bug: 868229
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2ad088d8637d461178e7e3af3017c923b6c1f4c3
Reviewed-on: https://chromium-review.googlesource.com/1248282Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594736}

third_party/blink/renderer/core/editing/markers/document_marker_controller.h

@@ -93,7 +93,6 @@ class CORE_EXPORT DocumentMarkerController final
                                  unsigned start_offset,
                                  unsigned end_offset,
                                  bool);
-  bool HasMarkers(const Node* node) const { return markers_.Contains(node); }
 
   // TODO(rlanday): can these methods for retrieving markers be consolidated
   // without hurting efficiency?

third_party/blink/renderer/core/paint/inline_text_box_painter.cc

@@ -88,13 +88,6 @@ LayoutObject& InlineTextBoxPainter::InlineLayoutObject() const {
       inline_text_box_.GetLineLayoutItem());
 }
 
-bool InlineTextBoxPainter::PaintsMarkerHighlights(
-    const LayoutObject& layout_object) {
-  return layout_object.GetNode() &&
-         layout_object.GetDocument().Markers().HasMarkers(
-             layout_object.GetNode());
-}
-
 static void ComputeOriginAndWidthForBox(const InlineTextBox& box,
                                         LayoutPoint& local_origin,
                                         LayoutUnit& width) {

third_party/blink/renderer/core/paint/inline_text_box_painter.h

@@ -65,8 +65,6 @@ class InlineTextBoxPainter {
                                       const ComputedStyle&,
                                       const Font&);
 
-  static bool PaintsMarkerHighlights(const LayoutObject&);
-
  private:
   enum class PaintOptions { kNormal, kCombinedText };