Ignore ::first-letter from ancestors in grids and flexboxes

Source/core/rendering/RenderBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 3727 matching lines @@
         } else if (currChild->isListMarker()) {
             currChild = currChild->nextSibling();
         } else if (currChild->isFloatingOrOutOfFlowPositioned()) {
             if (currChild->style()->styleType() == FIRST_LETTER) {
                 currChild = currChild->slowFirstChild();
                 break;
             }
             currChild = currChild->nextSibling();
         } else if (currChild->isReplaced() || currChild->isRenderButton() || currChild->isMenuList()) {
             break;
+        } else if (currChild->isFlexibleBoxIncludingDeprecated() || currChild->isRenderGrid()) {
+            return;
         } else if (currChild->style()->hasPseudoStyle(FIRST_LETTER) && currChild->canHaveGeneratedChildren())  {
             // We found a lower-level node with first-letter, which supersedes the higher-level style
             firstLetterBlock = currChild;
             currChild = currChild->slowFirstChild();
         } else {
             currChild = currChild->slowFirstChild();
         }
     }
 
-    if (!currChild || !isRenderBlockFlowOrRenderButton(firstLetterBlock))
+    if (!currChild)
         return;
 
     // If the child already has style, then it has already been created, so we just want
     // to update it.
     if (currChild->parent()->style()->styleType() == FIRST_LETTER) {
         updateFirstLetterStyle(firstLetterBlock, currChild);
         return;
     }
 
     // FIXME: This black-list of disallowed RenderText subclasses is fragile.
@@ skipping 593 matching lines @@
 void RenderBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const RenderObject* obj) const
 {
     showRenderObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink