Add description for Geolocation API deprecation messages
Add description for Geolocation API deprecation messages

These deprecation warnings will be translated and so descriptions of
the messages are required.

Fixed: 1318853,1318855
Change-Id: I08376d087684a31f0083087cafb39d69806ca726
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3602909
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>
Reviewed-by: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Commit-Queue: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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