Remove gfx::DIAGONAL_STRIKE and supporting code.

ui/gfx/render_text_harfbuzz.h

 // Copyright 2014 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.
 
 #ifndef UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 68 matching lines @@
 
   Font font;
   sk_sp<SkTypeface> skia_face;
   FontRenderParams render_params;
   int font_size;
   int baseline_offset;
   int baseline_type;
   bool italic;
   Font::Weight weight;
   bool strike;
-  bool diagonal_strike;
   bool underline;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TextRunHarfBuzz);
 };
 
 // Manages the list of TextRunHarfBuzz and its logical <-> visual index mapping.
 class TextRunList {
  public:
   TextRunList();
@@ skipping 170 matching lines @@
 
   // Fixed width of glyphs. This should only be set in test environments.
   float glyph_width_for_test_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_