Fix RenderTextMac.

ui/gfx/render_text_mac.mm

 // 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.
 
 #include "ui/gfx/render_text_mac.h"
 
 #import <AppKit/AppKit.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreText/CoreText.h>
 
@@ skipping 380 matching lines @@
       continue;
     }
 
     runs_.emplace_back();
     TextRun* run = &runs_.back();
     run->ct_run = ct_run;
     run->origin = run_origin;
     run->width = run_width;
     run->glyphs.resize(glyph_count);
     CTRunGetGlyphs(ct_run, empty_cf_range, &run->glyphs[0]);
-    // CTRunGetGlyphs() sometimes returns glyphs with value 65535 and zero
-    // width (this has been observed at the beginning of a string containing
-    // Arabic content). Passing these to Skia will trigger an assertion;
-    // instead set their values to 0.
-    for (size_t glyph = 0; glyph < glyph_count; glyph++) {
-      if (run->glyphs[glyph] == 65535)
-        run->glyphs[glyph] = 0;
-    }
 
     run->glyph_positions.resize(glyph_count);
     const CGPoint* positions_ptr = CTRunGetPositionsPtr(ct_run);
     std::vector<CGPoint> positions;
     if (positions_ptr == NULL) {
       positions.resize(glyph_count);
       CTRunGetPositions(ct_run, empty_cf_range, &positions[0]);
       positions_ptr = &positions[0];
     }
     for (size_t glyph = 0; glyph < glyph_count; glyph++) {
@@ skipping 39 matching lines @@
   // TODO(karandeepb): This is not invoked on any codepath currently. Style the
   // returned text if need be.
   if (obscured())
     return false;
 
   decorated_text->text = GetTextFromRange(range);
   return true;
 }
 
 }  // namespace gfx