Zoom propagation on navigation should respect settings.
Zoom propagation on navigation should respect settings.

The changes made in https://codereview.chromium.org/1009193003 failed
to check the current settings about whether or not embedder zoom should
propagate to the guest. This CL corrects that.

BUG=474452

Review URL: https://codereview.chromium.org/1070113004

(cherry picked from commit 37d3af9866aeb1f1cf175cea91cf5aa4b4f58b2a)

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#324451}
Cr-Commit-Position: fe94940391158563b8e4cf7888f93321f554af93@{#40}
Cr-Branched-From: 9fdd9ec11ee753dedeffe15e7e822b13445dc287@{#323860}

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