GitLab

Moving the PdfToEmfConverter interface to the printing service.
As a result, simplified the client of that interface in
chrome/browser/printing/pdf_to_emf_converter.cc:
- merging PdfConverterUtilityProcessHostClient and PdfConverterImpl.
- calls on the service can now happen on the UI thread instead of the
  IO thread

Renamed the mojom::PdfToEmfConverter implementation from
PdfToEmfConverterImpl to PdfToEmfConverter as is now preferred naming
style for Mojo interface implementation.

Bug: 766451
Change-Id: Ic748547f56bb193a558210f97558640ef8d6e44b
Reviewed-on: https://chromium-review.googlesource.com/826308Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524534}