Reland "Make things more const-y"chromium/3552

This reverts commit 5700d9e2eea5813861920995815ac092fd7df973.

Reason for revert: Harmless, I think.

Original change's description:
> Revert "Make things more const-y"
> 
> This reverts commit 882ed81dec7afc5bc106f965af34f1e59407fd95.
> 
> Reason for revert: Rule out that this be making embeddertest flakey.
> Seems improbable, but maybe the const is allowing the compiler to use stale data in a non-logically const operation ???
> 
> Original change's description:
> > Make things more const-y
> > 
> > Follow up to https://pdfium-review.googlesource.com/c/pdfium/+/42350
> > to use const more in the changed code.
> > 
> > BUG=chromium:881678
> > 
> > Change-Id: I7a88862952c9ba25ffa89c2827e1de322f3b5c33
> > Reviewed-on: https://pdfium-review.googlesource.com/42370
> > Commit-Queue: Ryan Harrison <rharrison@chromium.org>
> > Reviewed-by: Lei Zhang <thestig@chromium.org>
> > Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
> 
> TBR=thestig@chromium.org,hnakashima@chromium.org,rharrison@chromium.org
> 
> Change-Id: Ifee656f151d3e6dab6de33c3b96b37b9809004c4
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: chromium:881678
> Reviewed-on: https://pdfium-review.googlesource.com/42372
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Commit-Queue: Tom Sepez <tsepez@chromium.org>

TBR=thestig@chromium.org,tsepez@chromium.org,hnakashima@chromium.org,rharrison@chromium.org

Change-Id: I24de62969b039288596aa4d0b268ad49728e4891
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:881678
Reviewed-on: https://pdfium-review.googlesource.com/42393
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

0 files changed, 0 insertions, 0 deletions