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Fix for MIME handler bug. The bug resulted from a previous bugfix (https://codereview.chromium.org/939443002/) that added a conversion from logical to physical units to fix a similar sizing bug with other guestviews. However, MIME handler guests never use logical pixels, so this conversion broke their sizing when they are created in a zoomed embedder.

This patch adds a more robust method of checking whether sizes are provided in logical or physical units, and all cases are handled appropriately.

BUG=462194

Review URL: https://codereview.chromium.org/972193003

Cr-Commit-Position: refs/heads/master@{#318948}