Move gfx::ElideText functionality to RenderText.

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 26 matching lines @@
   BOLD = 0,
   ITALIC,
   STRIKE,
   DIAGONAL_STRIKE,
   UNDERLINE,
   NUM_TEXT_STYLES,
 };
 
 // Elision behaviors of text that exceeds constrained dimensions.
 enum ElideBehavior {
-  TRUNCATE = 0, // Do not elide or fade; the text may be truncated at the end.
+  NO_ELIDE = 0, // Do not modify the text, it may overflow its available bounds.
+  TRUNCATE,     // Do not elide or fade, just truncate at the end of the string.
   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_