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Preview can update page count, so PageNumberSet may represent page ranges incorrectly. Now PageNumberSet is used as temporarily objects which never stored.

PreviewGenerator stores PageRange which can be compared with other independently of current document size.

Removed code duplication in page ranges parsing code and parse directly to page ranges.

BUG=173822

Review URL: https://chromiumcodereview.appspot.com/12209086

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182005 0039d316-1c4b-4281-b951-d872f2087c98