Re-enabled TextEliderTest.TestHostEliding for iOS9.
Re-enabled TextEliderTest.TestHostEliding for iOS9.

secure_display::ElideHost does not work correctly on iOS, because this
function does not take into account kerning and trims url to shorter
string that could actually fit the proposed width. This is something
that may not worth fixing on iOS, so some test cases were simply
excluded from the test.

BUG=513703

Review URL: https://codereview.chromium.org/1280503002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342475}

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