Support decoding special characters in Assistant deep links.

Previously, deep link utils failed to decode URL encoded characters
when parsing parameters. Now, it does.

Bug: b:121003131
Change-Id: I4263e9d50d20ddebcb9cb8e8ca14d009360c52ef
Reviewed-on: https://chromium-review.googlesource.com/c/1376801
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#616598}
2 files changed