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Change all bracket notations in find_in_page.js to dot notations.

Use dot notations to get properties on Objects in find_in_page.js. This
is a preparation work for fix the bug(crbug.com/228585).

Bug: 228585
Change-Id: Ia0b371b914842f515589011b7182e7f8b121c924
Reviewed-on: https://chromium-review.googlesource.com/c/1339799
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608838}