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The result of ContentClient::GetUserAgent is known to be incorrect in
the renderer process, so get the value in the browser and pass it via
IPC.

Bug: 818450
Change-Id: Ia1af4c237b9d63059c634cd0bbb41ab53436b8cd
Reviewed-on: https://chromium-review.googlesource.com/c/1352119Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611599}