Move print preview specific document loaded code to dedicated method.
This is the last step before migrating DocumentLoadComplete() from
OutOfProcessInstance to PdfViewPluginBase, so the implmentation can be
used by PdfViewWebPlugin as well.
Bug: 1140629
Change-Id: I9cd1fce573bde5b415ec98176b5b2a3884d6d849
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2786215
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#866775}
d44f024afd