Remove "Move window to..." from gear menu.
This CL removes:
- "Move window to..." menu item from the gear menu.
- Remove APIs fileBrowserPrivate.onProfileAdded and fileBrowserPrivate.onDesktopChanged as they are used only for updating gear menu.
- Remove corresponding tests.
BUG=408965
TEST=run browser_test, unit_tests
TBR=benwells@chromium.org
# TBRing for just removing unused events from file_browser_private.idl
Review URL: https://codereview.chromium.org/
530553006
Cr-Commit-Position: refs/heads/master@{#292860}