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The omnibox was accepting raw text from drag data when such text
was left empty by stripping Javascript schemas and whitespace.
This allowed invalid omnibox edit text content, containing e.g.
newline characters which would then render with confusing glyphs.
This CL fixes the issue by using the sanitized text even if empty.

Bug: 904380
Change-Id: Ia43a9429d200261a929e858681cb771e6b8bc91c
Reviewed-on: https://chromium-review.googlesource.com/c/1334558Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608865}