Delete some dead ScrollAlignment code.

sky/engine/core/editing/EditingBehavior.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2010 Apple Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 28 matching lines @@
     // the editable content on Mac and Linux.
     bool shouldMoveCaretToHorizontalBoundaryWhenPastTopOrBottom() const
     {
         return false;
     }
 
     // On Windows, selections should always be considered as directional, regardless if it is
     // mouse-based or keyboard-based.
     bool shouldConsiderSelectionAsDirectional() const { return true; }
 
-    // On Mac, when revealing a selection (for example as a result of a Find operation on the Browser),
-    // content should be scrolled such that the selection gets certer aligned.
-    bool shouldCenterAlignWhenSelectionIsRevealed() const { return false; }
-
     // On Mac, style is considered present when present at the beginning of selection. On other platforms,
     // style has to be present throughout the selection.
     bool shouldToggleStyleBasedOnStartOfSelection() const { return false; }
 
     // Standard Mac behavior when extending to a boundary is grow the selection rather than leaving the base
     // in place and moving the extent. Matches NSTextView.
     bool shouldAlwaysGrowSelectionWhenExtendingToBoundary() const { return false; }
 
     // On Mac, when processing a contextual click, the object being clicked upon should be selected.
     bool shouldSelectOnContextualMenuClick() const { return false; }
@@ skipping 28 matching lines @@
     // Convert a KeyboardEvent to a command name like "Copy", "Undo" and so on.
     // If nothing, return empty string.
     const char* interpretKeyEvent(const KeyboardEvent&) const;
 
     bool shouldInsertCharacter(const KeyboardEvent&) const;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_EDITING_EDITINGBEHAVIOR_H_