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Previously, the PDF extension UI was zoomed to the default zoom level
and the PDF was inversely affected (due to various calculations using
zoomed and not zoomed sizes). This resets the zoom level for extensions
used as mime handlers on mime handler WebContents creation and for print
preview (as the PDF extension zoom as controlled by the embedding print
preview dialog WebContents.

BUG=450910

Review URL: https://codereview.chromium.org/881553003

Cr-Commit-Position: refs/heads/master@{#313444}