Rename Caret.{h,cpp} to CaretBase to match class.

Source/core/editing/CaretBase.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 COMPUTER, 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 COMPUTER, 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.
  */
 
 #include "config.h"
-#include "core/editing/Caret.h"
+#include "core/editing/CaretBase.h"
 
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 CaretBase::CaretBase(CaretVisibility visibility)
     : m_caretVisibility(visibility)
 {
 }
 
 void CaretBase::clearCaretRect()
 {
     m_caretLocalRect = LayoutRect();
 }
 
 static inline bool caretRendersInsideNode(Node* node)
 {
     return node && !isRenderedTableElement(node) && !editingIgnoresContent(node);
 }
 
 LayoutBlock* CaretBase::caretLayoutObject(Node* node)
 {
     if (!node)
-        return 0;
+        return nullptr;
 
     LayoutObject* layoutObject = node->layoutObject();
     if (!layoutObject)
-        return 0;
+        return nullptr;
 
     // if caretNode is a block and caret is inside it then caret should be painted by that block
     bool paintedByBlock = layoutObject->isLayoutBlock() && caretRendersInsideNode(node);
     return paintedByBlock ? toLayoutBlock(layoutObject) : layoutObject->containingBlock();
 }
 
 static void mapCaretRectToCaretPainter(LayoutObject* caretLayoutObject, LayoutBlock* caretPainter, LayoutRect& caretRect)
 {
     // FIXME: This shouldn't be called on un-rooted subtrees.
     // FIXME: This should probably just use mapLocalToContainer.
@@ skipping 123 matching lines @@
     else
         element = node->parentElement();
 
     if (element && element->layoutObject())
         caretColor = element->layoutObject()->resolveColor(CSSPropertyColor);
 
     context->fillRect(FloatRect(caret), caretColor);
 }
 
 } // namespace blink