Replace forward class declarations of VisibleSelection to include directive

Source/core/editing/commands/TextInsertionBaseCommand.h

 /*
  * Copyright (C) 2012 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TextInsertionBaseCommand_h
 #define TextInsertionBaseCommand_h
 
+#include "core/editing/VisibleSelection.h"
 #include "core/editing/commands/CompositeEditCommand.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Document;
-class VisibleSelection;
 
 class TextInsertionBaseCommand : public CompositeEditCommand {
 public:
     ~TextInsertionBaseCommand() override { }
 
 protected:
     explicit TextInsertionBaseCommand(Document&);
     static void applyTextInsertionCommand(LocalFrame*, PassRefPtrWillBeRawPtr<TextInsertionBaseCommand>, const VisibleSelection& selectionForInsertion, const VisibleSelection& endingSelection);
 };
 
@@ skipping 16 matching lines @@
     } else {
         unsigned length = string.length();
         if (length != offset)
             operation(offset, length - offset, true);
     }
 }
 
 }
 
 #endif