Apply more unique_ptr to line box management.
<https://webkit.org/b/123857>
Make all of the functions that return newly-created line boxes
return them packed up in std::unique_ptrs.
There is one exception in RenderBlockLineLayout where the function
createInlineBoxForRenderer() is inconsistent about the ownership of
the returned object. This will be addressed by a subsequent patch.
We now "release" the line boxes into their various home structures,
so the pointer smartness doesn't go end-to-end just yet.
Reviewed by Anders Carlsson.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158718 268f45cc-cd09-0410-ab3c-d52691b4dbfc
22 files changed
