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On drag selection, the steady state URL should not be unelided until
the mouse is released, at which point it should be unelided.

The selection should be adjusted so that the same portion is selected
even after the prefix is reattached.

This CL tests that.

Bug: 797354
Change-Id: Ie6a6a6dcbe08f2eba3def90595b496cfff4206b8
Reviewed-on: https://chromium-review.googlesource.com/1008878
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550694}