third_party/WebKit: fix typos found in comments

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1960 matching lines @@
     LayoutBlock::addChild(newChild, beforeChild);
 }
 
 void LayoutBlockFlow::moveAllChildrenIncludingFloatsTo(LayoutBlock* toBlock, bool fullRemoveInsert)
 {
     LayoutBlockFlow* toBlockFlow = toLayoutBlockFlow(toBlock);
     moveAllChildrenTo(toBlockFlow, fullRemoveInsert);
 
     // When a portion of the layout tree is being detached, anonymous blocks
     // will be combined as their children are deleted. In this process, the
-    // anonymous block later in the tree is merged into the one preceeding it.
+    // anonymous block later in the tree is merged into the one preceding it.
     // It can happen that the later block (this) contains floats that the
     // previous block (toBlockFlow) did not contain, and thus are not in the
     // floating objects list for toBlockFlow. This can result in toBlockFlow containing
     // floats that are not in it's floating objects list, but are in the
     // floating objects lists of siblings and parents. This can cause problems
     // when the float itself is deleted, since the deletion code assumes that
     // if a float is not in it's containing block's floating objects list, it
     // isn't in any floating objects list. In order to preserve this condition
     // (removing it has serious performance implications), we need to copy the
     // floating objects from the old block (this) to the new block (toBlockFlow).
@@ skipping 1114 matching lines @@
     FrameView* frameView = document().view();
     LayoutUnit top = (style()->position() == FixedPosition) ? 0 : frameView->scrollOffset().height();
     int visibleHeight = frameView->visibleContentRect(IncludeScrollbars).height();
     if (size().height() < visibleHeight)
         top += (visibleHeight - size().height()) / 2;
     setY(top);
     dialog->setCentered(top);
 }
 
 } // namespace blink