Print Preview: Fixing page range validation when user enters 0.
Print Preview: Fixing page range validation when user enters 0.

BUG=Enter 0 in the pages field, the preview is loading indefinitely.
TEST=Enter 0, an error message should be displayed.


Review URL: http://codereview.chromium.org/7115004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@88070 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,ropik/chromium,ropik/chromium,adobe/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,yitian134/chromium