In current design, chrome.webcamPrivate.reset(id, {pan: 0, tilt: 0, zoom: 0}) does the same thing as chrome.webcamPrivate.reset(id, {pan: 1, tilt: 1, zoom: 1}), which resets pan &tilt & zoom. It might cause confusion, as seen in crbug.com/526893.
In current design, chrome.webcamPrivate.reset(id, {pan: 0, tilt: 0, zoom: 0}) does the same thing as
chrome.webcamPrivate.reset(id, {pan: 1, tilt: 1, zoom: 1}), which resets pan &tilt & zoom.
It might cause confusion, as seen in crbug.com/526893.

BUG=None

Review URL: https://codereview.chromium.org/1328943003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#348021}

CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend