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Previously we leave the weather settings as their default values on the
server side, which causes an unpredictable behavior on whether server
will return weather info to us in the response. This CL fixed this issue
by setting these values explicitly to notify server that we are always
expecting weather info to be included in the response.

Related CL:
https://chrome-internal-review.googlesource.com/c/chrome/assistant/+/3215310

Bug: b/158630188
Test: manually
Change-Id: I0e38e9fa46d22e36a6e5f6e2f42f84818acea433
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363914
Commit-Queue: Meilin Wang <meilinw@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802702}