Revert "Launching an external protocol handler now escapes the URL."

This reverts commit 2401e58572884b3561e4348d64f11ac74667ef02.

Reason for revert: Broke unit_tests on builders.
https://ci.chromium.org/buildbot/chromium.linux/Linux%20Tests%20%28dbg%29%281%29%2832%29/46140

Original change's description:
> Launching an external protocol handler now escapes the URL.
> 
> Fixes bug introduced in r102449.
> 
> Bug: 785809
> Change-Id: I9e6dd1031dd7e7b8d378b138ab151daefdc0c6dc
> Reviewed-on: https://chromium-review.googlesource.com/778747
> Commit-Queue: Matt Giuca <mgiuca@chromium.org>
> Reviewed-by: Eric Lawrence <elawrence@chromium.org>
> Reviewed-by: Ben Wells <benwells@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#518848}

TBR=benwells@chromium.org,mgiuca@chromium.org,elawrence@chromium.org

Change-Id: I74fa862034e6fba34ddb0b2ef848c700d5287c83
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 785809
Reviewed-on: https://chromium-review.googlesource.com/787031
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518868}
2 files changed