Reviewed by Shinichiro Hamaji.

        Refactor layout tests for printing to use common code.

        https://bugs.webkit.org/show_bug.cgi?id=40559

        * printing/numberOfPages-expected.txt:
        * printing/numberOfPages.html:
        * printing/page-break-always-expected.txt:
        * printing/page-break-always-for-overflow-expected.txt:
        * printing/page-break-always-for-overflow.html:
        * printing/page-break-always.html:
        * printing/page-break-inside-avoid-expected.txt: Added.
        * printing/page-break-inside-avoid.html: Added.
        * printing/page-break-inside-expected.txt: Removed.
        * printing/page-break-inside.html: Removed.
        * printing/pageNumerForElementById-expected.txt:
        * printing/pageNumerForElementById.html:
        * printing/resources/paged-media-test-utils.js:
        (numberOfPagesShouldBe):
        (ratioToPageHeightToPixels):
        (createBlockWithRatioToPageHeight):
        (createBlockWithNumberOfLines):
        * printing/script-tests/TEMPLATE.html:
        * printing/script-tests/numberOfPages.js:
        (test):
        * printing/script-tests/page-break-always-for-overflow.js:
        (test):
        * printing/script-tests/page-break-always.js:
        (test):
        * printing/script-tests/page-break-inside-avoid.js: Added.
        (test):
        * printing/script-tests/page-break-inside.js: Removed.
        * printing/script-tests/pageNumerForElementById.js:
        (test):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@61309 268f45cc-cd09-0410-ab3c-d52691b4dbfc