Reviewed by Sam Weinig.

Eliminate the need to pass the toChildrenList to the moveChild functions by tightening up the type of the
|to| argument to be a RenderBlock.
        
Add a moveChildrenTo function that can move a range of children, and patch places that were doing this
by hand.

Make the append forms of the functions just use the insert forms with a beforeChild of 0.
        
Patch insertChildNode in RenderObjectChildList so that it passes the fullInsert parameter through in the
case where it does an append.
        
Add an assert to RenderLayer that catches bad structure built when the fullInsert/Remove parameters are
messed up when using append/insertChildNode.

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::splitAnonymousBlocksAroundChild):
(WebCore::RenderBlock::makeChildrenAnonymousColumnBlocks):
(WebCore::RenderBlock::createAndAppendRootInlineBox):
(WebCore::RenderBlock::moveChildTo):
(WebCore::RenderBlock::moveChildrenTo):
(WebCore::RenderBlock::makeChildrenNonInline):
(WebCore::RenderBlock::removeChild):
* rendering/RenderBlock.h:
(WebCore::RenderBlock::moveChildTo):
(WebCore::RenderBlock::moveAllChildrenTo):
(WebCore::RenderBlock::moveChildrenTo):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::addChild):
* rendering/RenderObjectChildList.cpp:
(WebCore::RenderObjectChildList::insertChildNode):
* rendering/RenderRubyBase.cpp:
(WebCore::RenderRubyBase::moveInlineChildren):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@60282 268f45cc-cd09-0410-ab3c-d52691b4dbfc