GitLab

According to the mock, change the string "Request tablet site" to
"Request mobile site".

Bug: 953577
Change-Id: Ie037b06466db3bb73cc28edd409d939fb46522e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634713Reviewed-by: Min Chen <minch@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664524}