This is code readability patch, No Layout Test case needed

Source/platform/fonts/GlyphPageTreeNode.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 152 matching lines @@
 
                 if (start == 0) {
                     // Control characters must not render at all.
                     for (i = 0; i < 0x20; ++i)
                         buffer[i] = zeroWidthSpace;
                     for (i = 0x7F; i < 0xA0; i++)
                         buffer[i] = zeroWidthSpace;
                     buffer[softHyphen] = zeroWidthSpace;
 
                     // \n, \t, and nonbreaking space must render as a space.
-                    buffer[(int)'\n'] = ' ';
-                    buffer[(int)'\t'] = ' ';
-                    buffer[noBreakSpace] = ' ';
+                    buffer[newlineCharacter] = space;
+                    buffer[characterTabulation] = space;
+                    buffer[noBreakSpace] = space;
                 } else if (start == (leftToRightMark & ~(GlyphPage::size - 1))) {
                     // LRM, RLM, LRE, RLE, ZWNJ, ZWJ, and PDF must not render at all.
                     buffer[leftToRightMark - start] = zeroWidthSpace;
                     buffer[rightToLeftMark - start] = zeroWidthSpace;
                     buffer[leftToRightEmbed - start] = zeroWidthSpace;
                     buffer[rightToLeftEmbed - start] = zeroWidthSpace;
                     buffer[leftToRightOverride - start] = zeroWidthSpace;
                     buffer[rightToLeftOverride - start] = zeroWidthSpace;
                     buffer[zeroWidthNonJoiner - start] = zeroWidthSpace;
                     buffer[zeroWidthJoiner - start] = zeroWidthSpace;
@@ skipping 228 matching lines @@
         printf("\nPage %d:\n", it->key);
         showGlyphPageTree(it->key);
     }
 }
 
 void showGlyphPageTree(unsigned pageNumber)
 {
     blink::GlyphPageTreeNode::getRoot(pageNumber)->showSubtree();
 }
 #endif