This is code readability patch, No Layout Test case needed

Source/platform/fonts/GlyphPageTreeNode.cpp

Index: Source/platform/fonts/GlyphPageTreeNode.cpp
diff --git a/Source/platform/fonts/GlyphPageTreeNode.cpp b/Source/platform/fonts/GlyphPageTreeNode.cpp
index 052e90924004d4d8cc4e32c7d18521b0acc2042e..a19ca862c683eb0a3671e1c725b75c04bb99e21a 100644
--- a/Source/platform/fonts/GlyphPageTreeNode.cpp
+++ b/Source/platform/fonts/GlyphPageTreeNode.cpp
@@ -170,9 +170,9 @@ void GlyphPageTreeNode::initializePage(const FontData* fontData, unsigned pageNu
                     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;