For some reason whenever I try to save a webpage as a PDF Chrome generates a 0-byte size document. And when I try to open the PDF in my Downloads folder QuickPDF tells me "Error while opening file. It appears to be damamged." My phone is a Moto G if it helps.
Alternatively visit http://www.web2pdfconvert.com/ and paste the url which you want as a PDF.
If you want to download pdf via app, try free app named "UrlToPdf" from play store.