Wrong watchstar icons were specified when splitting the watchstar
into modern and legacy Vector in 3c0559a7.
Change-Id: Ice369f5d81818b093014cf508c2d4336c66368ed
Consolidates the CSS responsible for styling chevrons into one
implementation. This removes the need for custom padding and
background positioning for the following components:
- "more" menu
- user menu
- watchstar
- language button
- languge button in sticky header
Instead of absolutely positioning the chevron on these components,
the parent label element is set to `display: inline-flex` so that
the chevron is vertically aligned and given enough space by default.
The watchstar, although not a chevron, is also given the
`display: inline-flex` treatment so that it can be aligned with
other elements in the toolbar.
This new implementation requires splitting the watchstar
component into legacy and modern due to a quirk in Firefox that
causes a bug with the watchstar in legacy Vector.
NOTE: This change causes visual changes due to the difference in
centering the chevrons via flexbox vs percentage positions.
Bug: T308344, T310838
Change-Id: Ie9e0fce1366cd25a5899fee49770de4a09424fe2
