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This test breaks up OmniboxViewTest.PreserveDisplayTextOnFocusSearch,
which was a browser test, into three smaller unit tests.

OmniboxViewTest.PreserveDisplayTextOnFocusSearch is flaky, and the
whole set of OmniboxViewTest.* browser tests have been flaky for at
least a year.

Bug: 751031
Change-Id: I6e7a8fc88f55fee706cdfc1ee0617ce4a27f5103
Reviewed-on: https://chromium-review.googlesource.com/1232525Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593246}