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The omnibox drops slightly when fading.  Previously, the omnibox was moved by
adjusting its CSS margins. This is an inefficient way to handle movement (it
wastes space and doesn't always appear smooth).

BUG=641508
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2622593003
Cr-Commit-Position: refs/heads/master@{#442923}