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This CL does code refactoring to make the intent of PdfAccessibilityTree
.zoom variable clear. It stores the product of pdf zoom and system dpi.
This change renames it to zoom_device_scale_factor.

This change also refactors the zoom variable name in
PP_PrivateAccessibilityViewportInfo to zoom_device_scale_factor.

Corresponding change is also made in OutOfProcessInstance to reflect
the variable name change.

Bug: 1007169
Change-Id: I0a9c22f386fb4859afc80d9f281f41a15935bb09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823337Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ian Prest <iapres@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Virender Singh <virens@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#705947}