Comment A look inside chrome://plugins/ reveals: (Score 0, Flamebait) 285
C:\Users\#########\AppData\Local\Google\Chrome\Application\6.0.437.3\pdf.dll (MIME type: application/pdf)
Adobe's PDF plugin:
C:\Program Files (x86)\Adobe\Acrobat 9.0\Acrobat\Browser\nppdf32.dll (MIME types: application/pdf, application/vnd.adobe.pdfxml, application/vnd.adobe.x-mars, application/vnd.fdf, application/vnd.adobe.xfdf, application/vnd.adobe.xdp+xml, application/vnd.adobe.xfd+xml)
The files themselves appear to be quite different, and handle different MIME types, so hopefully this is not simply Adobe's stuff packaged within Chrome.