LayoutTests:

      Reviewed by thatcher
        
        Added:
        * editing/pasteboard/interchange-newline-4-expected.checksum: Added.
        * editing/pasteboard/interchange-newline-4-expected.png: Added.
        * editing/pasteboard/interchange-newline-4-expected.txt: Added.
        * editing/pasteboard/interchange-newline-4.html: Added.
        * editing/deleting/paragraph-in-preserveNewline-expected.checksum: Added.
        * editing/deleting/paragraph-in-preserveNewline-expected.png: Added.
        * editing/deleting/paragraph-in-preserveNewline-expected.txt: Added.
        * editing/deleting/paragraph-in-preserveNewline.html: Added.
        
        Equivalent render trees, fixes, or bugs exposed (10427, 10428):
        * editing/execCommand/insertHTML-expected.checksum:
        * editing/execCommand/insertHTML-expected.png:
        * editing/execCommand/insertHTML-expected.txt:
        * editing/execCommand/insertHTML.html:
        * editing/execCommand/insertHorizontalRule-expected.checksum:
        * editing/execCommand/insertHorizontalRule-expected.png:
        * editing/execCommand/insertHorizontalRule-expected.txt:
        * editing/inserting/insert-3786362-fix-expected.checksum:
        * editing/inserting/insert-3786362-fix-expected.png:
        * editing/inserting/insert-3786362-fix-expected.txt:
        * editing/inserting/insert-3786362-fix.html:
        * editing/inserting/insert-3907422-fix-expected.txt:
        * editing/pasteboard/3976872-expected.checksum:
        * editing/pasteboard/3976872-expected.png:
        * editing/pasteboard/3976872-expected.txt:
        * editing/pasteboard/4076267-3-expected.checksum:
        * editing/pasteboard/4076267-3-expected.png:
        * editing/pasteboard/4076267-3-expected.txt:
        * editing/pasteboard/4076267-3.html:
        * editing/pasteboard/4076267-expected.checksum:
        * editing/pasteboard/4076267-expected.png:
        * editing/pasteboard/4076267-expected.txt:
        * editing/p