Remove gfx::DIAGONAL_STRIKE and supporting code.

ui/gfx/text_constants.h

 // Copyright (c) 2012 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_TEXT_CONSTANTS_H_
 #define UI_GFX_TEXT_CONSTANTS_H_
 
 namespace gfx {
 
 // TODO(msw): Distinguish between logical character stops and glyph stops?
@@ skipping 59 matching lines @@
   DIRECTIONALITY_FROM_UI,       // Use the UI locale's text reading direction.
   DIRECTIONALITY_FORCE_LTR,     // Use LTR regardless of content or UI locale.
   DIRECTIONALITY_FORCE_RTL,     // Use RTL regardless of content or UI locale.
 };
 
 // Text styles and adornments.
 // TODO(msw): Merge with gfx::Font::FontStyle.
 enum TextStyle {
   ITALIC = 0,
   STRIKE,
-  DIAGONAL_STRIKE,
   UNDERLINE,
   NUM_TEXT_STYLES,
 };
 
 // Text baseline offset types.
 // Figure of font metrics:
 //   +--------+--------+------------------------+-------------+
 //   |        |        | internal leading       | SUPERSCRIPT |
 //   |        |        +------------+-----------|             |
 //   |        | ascent |            | SUPERIOR  |-------------+
@@ skipping 17 matching lines @@
   ELIDE_HEAD,   // Add an ellipsis at the start of the string.
   ELIDE_MIDDLE, // Add an ellipsis in the middle of the string.
   ELIDE_TAIL,   // Add an ellipsis at the end of the string.
   ELIDE_EMAIL,  // Add ellipses to username and domain substrings.
   FADE_TAIL,    // Fade the string's end opposite of its horizontal alignment.
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_TEXT_CONSTANTS_H_