Remove gfx::DIAGONAL_STRIKE and supporting code.

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index 912ebb2e555962bace34df0facaeb2590dedac04..001d47055f857fae3c5be2abcc96677d7f3bfabc 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -658,7 +658,6 @@ TextRunHarfBuzz::TextRunHarfBuzz(const Font& template_font)
       italic(false),
       weight(Font::Weight::NORMAL),
       strike(false),
-      diagonal_strike(false),
       underline(false) {}
 
 TextRunHarfBuzz::~TextRunHarfBuzz() {}
@@ -1326,15 +1325,12 @@ void RenderTextHarfBuzz::DrawVisualText(internal::SkiaTextRenderer* renderer) {
                    SkIntToScalar(origin.x()))
                 : positions[colored_glyphs.end() - glyphs_range.start()].x());
         renderer->DrawDecorations(start_x, origin.y(), end_x - start_x,
-                                  run.underline, run.strike,
-                                  run.diagonal_strike);
+                                  run.underline, run.strike);
       }
       preceding_segment_widths += SkFloatToScalar(segment.width());
     }
   }
 
-  renderer->EndDiagonalStrike();
-
   UndoCompositionAndSelectionStyles();
 }
 
@@ -1403,7 +1399,6 @@ void RenderTextHarfBuzz::ItemizeTextToRuns(
     run->italic = style.style(ITALIC);
     run->baseline_type = style.baseline();
     run->strike = style.style(STRIKE);
-    run->diagonal_strike = style.style(DIAGONAL_STRIKE);
     run->underline = style.style(UNDERLINE);
     run->weight = style.weight();
     int32_t script_item_break = 0;
@@ -1730,7 +1725,6 @@ bool RenderTextHarfBuzz::GetDecoratedTextForRange(
           run.font.Derive(0, style, run.weight));
 
       attribute.strike = run.strike;
-      attribute.diagonal_strike = run.diagonal_strike;
       decorated_text->attributes.push_back(attribute);
     }
   }