Delete dead code for deleting pages and icons.
1) Document::deletePages()
2) CPDFSDK_Document::DeletePages()
3) Document::removeIcon()
4) IconTree::DeleteIconElement()
Originally (1) called (2), but only when FOXIT_CHROME_BUILD was not
defined. Since it was always defined for PDFium, this was effectively
dead code the whole time. Ditto for (3) and (4). The functions were
deemed unsafe in https://crbug.com/67100
R=jam@chromium.org
Review URL: https://codereview.chromium.org/1193323002.
4 files changed
