Milo Refactor: Remove theme support

milo/appengine/console/html_data.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package console
 
-import "github.com/luci/luci-go/milo/appengine/settings"
+import "github.com/luci/luci-go/milo/appengine/common"
 
-// TestableConsole is a subclass of Build that interfaces with TestableHandler and
-// includes sample test data.
-type TestableConsole struct{ Console }
-
-// TestData returns sample test data.
-func (x Console) TestData() (result []settings.TestBundle) {
+// ConsoleTestData returns sample console data.
+func ConsoleTestData() (result []common.TestBundle) {
         return
 }