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The search box placeholder text and accessible names for clamshell and
tablet mode were being pushed from Chrome's app list client. Though,
the strings do not depend on any Chrome state - the app list client just
loads the strings when Chrome starts, and pushes them to the app list
controller. It's much simpler to set the strings ash (similar to close
and assistant button tooltips).

Additionally, this ensures that the strings are retrieved when first
needed. Given that the app list is first used in active user session,
this should ensure that the string used is not using the default locale
from when the profile is first created during user adding flow.

Moves logic that tracks tablet mode state from SearchBoxViewBase to
SearchBoxView class (given that SearchBoxView is the only specialization
that cares about tablet mode state).

Bug:1083787

AX-Relnotes: n/a

Change-Id: I867a699c36e42a2b9896f448c3e01645e526fcf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2205979Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769809}