Added additional logging for strange error messages.

BUG=263527
TEST=none

Review URL: https://codereview.chromium.org/70173007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235819 0039d316-1c4b-4281-b951-d872f2087c98
Move PDF to PWG conversion into PrivetLocalPrintOperationImpl

Change the format of the data provided to PrivetLocalPrintOperationImpl to
RefCountedBytes. Remove PrivetLocalPrintRequestPDF/PrivetLocalPrintRequestPWG.
Have users provide PDF data consistently, and do conversin in the
PrivetLocalPrintOperation.

BUG=318373

Review URL: https://codereview.chromium.org/73503002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235820 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235819
SVN changes up to revision 235820