Use tighter typing in editing: FormatBlockCommand / FrameSelection

Source/core/editing/InputMethodController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 349 matching lines @@
     if (start >= end)
         return nullptr;
     return Range::create(m_compositionNode->document(), m_compositionNode.get(), start, m_compositionNode.get(), end);
 }
 
 PlainTextRange InputMethodController::getSelectionOffsets() const
 {
     RefPtrWillBeRawPtr<Range> range = m_frame.selection().selection().firstRange();
     if (!range)
         return PlainTextRange();
-    Node* editable = m_frame.selection().rootEditableElementOrTreeScopeRootNode();
+    ContainerNode* editable = m_frame.selection().rootEditableElementOrTreeScopeRootNode();
     ASSERT(editable);
     return PlainTextRange::create(*editable, *range.get());
 }
 
 bool InputMethodController::setSelectionOffsets(const PlainTextRange& selectionOffsets)
 {
     if (selectionOffsets.isNull())
         return false;
     Element* rootEditableElement = m_frame.selection().rootEditableElement();
     if (!rootEditableElement)
@@ skipping 37 matching lines @@
         if (!setSelectionOffsets(PlainTextRange(std::max(static_cast<int>(selectionOffsets.start()) - before, 0), selectionOffsets.end() + after)))
             return;
         if (before == 0)
             break;
         ++before;
     } while (m_frame.selection().start() == m_frame.selection().end() && before <= static_cast<int>(selectionOffsets.start()));
     TypingCommand::deleteSelection(*m_frame.document());
 }
 
 } // namespace blink