[Editing] Add null check in |DeleteSelectionCommand::removeRedundantBlocks()|

third_party/WebKit/Source/core/editing/commands/ApplyStyleCommand.h

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "core/html/HTMLElement.h"
 
 namespace blink {
 
 class EditingStyle;
 class HTMLSpanElement;
 class StyleChange;
 
 enum ShouldIncludeTypingStyle { IncludeTypingStyle, IgnoreTypingStyle };
 
-class ApplyStyleCommand final : public CompositeEditCommand {
+class CORE_EXPORT ApplyStyleCommand final : public CompositeEditCommand {
  public:
   enum EPropertyLevel { PropertyDefault, ForceBlockProperties };
   enum InlineStyleRemovalMode { RemoveIfNeeded, RemoveAlways, RemoveNone };
   enum EAddStyledElement { AddStyledElement, DoNotAddStyledElement };
   typedef bool (*IsInlineElementToRemoveFunction)(const Element*);
 
   static ApplyStyleCommand* create(Document& document,
                                    const EditingStyle* style,
                                    InputEvent::InputType inputType,
                                    EPropertyLevel level = PropertyDefault) {
@@ skipping 156 matching lines @@
   StyleAttributeShouldBeEmpty
 };
 bool isEmptyFontTag(const Element*,
                     ShouldStyleAttributeBeEmpty = StyleAttributeShouldBeEmpty);
 bool isLegacyAppleHTMLSpanElement(const Node*);
 bool isStyleSpanOrSpanWithOnlyStyleAttribute(const Element*);
 
 }  // namespace blink
 
 #endif