views: Remove unused APIView class.
views: Remove unused APIView class.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

hackerkid/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,zulip/zulip,tommyip/zulip,hackerkid/zulip,hackerkid/zulip,timabbott/zulip,timabbott/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,rht/zulip,showell/zulip,eeshangarg/zulip,kou/zulip,shubhamdhama/zulip,andersk/zulip,showell/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,synicalsyntax/zulip,zulip/zulip,zulip/zulip,brainwane/zulip,synicalsyntax/zulip,timabbott/zulip,showell/zulip,timabbott/zulip,brainwane/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,showell/zulip,eeshangarg/zulip,brainwane/zulip,punchagan/zulip,shubhamdhama/zulip,synicalsyntax/zulip,andersk/zulip,andersk/zulip,tommyip/zulip,andersk/zulip,synicalsyntax/zulip,showell/zulip,rht/zulip,rht/zulip,rht/zulip,punchagan/zulip,shubhamdhama/zulip,brainwane/zulip,punchagan/zulip,rht/zulip,andersk/zulip,kou/zulip,rht/zulip,zulip/zulip,andersk/zulip,tommyip/zulip,synicalsyntax/zulip,tommyip/zulip,tommyip/zulip,punchagan/zulip,timabbott/zulip,showell/zulip,punchagan/zulip,zulip/zulip,shubhamdhama/zulip,shubhamdhama/zulip,timabbott/zulip,tommyip/zulip,eeshangarg/zulip,shubhamdhama/zulip,brainwane/zulip,kou/zulip,shubhamdhama/zulip,brainwane/zulip,tommyip/zulip,andersk/zulip,synicalsyntax/zulip,showell/zulip,punchagan/zulip