* [AI Chat] Disable chromium Actor UI Task Button
When an actor framework task is invoked, the button shows due to kGlicActorUiTaskIcon being true. Interacting with this button causes a crash.
First we will disable the button entirely, via this PR.
Then we will bring the functionality either in a custom Brave button and menu, or fix the upstream one.
Tests
Guards the kGlicActorUiTaskIcon=false override in chromium_src/chrome/
common/chrome_features.cc against regressions: while the agent profile
window is executing a task, neither the toolbar nor the tab strip
action container should construct the upstream
GlicAndActorButtonsContainer (which has been the source of crashes).
Pete Miller
3dcdad4c8a