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This CL updates the GMC toolbar button's tooltip string from "Global
Media Controls" to "Control your music, videos, and more"

Bug: 991271
Change-Id: Ie2554ac6102421e7f12f80b2dc64c16f9eeb4f2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758218Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688373}