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Several browser_test test suites implemented the same version of a
helper function to check if a particular element is visible. This CL
refactor these tests to use an already commonly available util function.

The original isVisible functionality is moved to isChildVisible and
isVisible is adjusted to directly check the element parameter. Call sites
that relied on the previous behavior have been refactored to use
isChildVisible.

Bug: 814436
Change-Id: I1d75f0562cd8ba789fab3e89bbd115ea7c85862b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030921Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Cr-Commit-Position: refs/heads/master@{#738653}