Bug 398825 - Implement selectSubString. r=heycam

--HG--
rename : content/svg/content/test/test_getSubStringLength.xhtml => content/svg/content/test/test_selectSubString.xhtml
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString-2-ref.svg
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString-2.svg
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString-3-ref.svg
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString-3.svg
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString-ref.svg
rename : layout/reftests/svg/text/simple-selection.svg => layout/reftests/svg/text/selectSubString.svg
Bug 398825 - Implement selectSubString. r=heycam

--HG--
rename : content/svg/content/test/getSubStringLength-helper.svg => content/svg/content/test/selectSubString-helper.svg