[Lacros] Run multi profile feature tests with Lacros disabled

Lacros does not support the ChromeOS Legacy multi profile feature.

Various tests in chrome_shelf_controller_unittest.cc previously failed
if the LacrosSupport flag was enabled.

Such tests are now run with the flag explicitly disabled.

Bug: 1258445
Change-Id: If3e180992354fab71fdbf0ad1705637c65adfded
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3216927
Auto-Submit: Eric Willigers <[email protected]>
Commit-Queue: Stefan Kuhne <[email protected]>
Reviewed-by: Stefan Kuhne <[email protected]>
Cr-Commit-Position: refs/heads/main@{#930230}

Author: ericwilligers

chrome/browser/ui/ash/shelf/chrome_shelf_controller_unittest.cc

@@ -1296,7 +1296,11 @@ class V2App {
 class MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest
     : public ChromeShelfControllerTestBase {
  protected:
-  MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest() = default;
+  MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest() {
+    // Lacros does not support the ChromeOS Legacy multi profile feature.
+    scoped_feature_list_.InitAndDisableFeature(
+        chromeos::features::kLacrosSupport);
+  }
   MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest(
       const MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest&) =
       delete;
@@ -1413,6 +1417,7 @@ class MultiProfileMultiBrowserShelfLayoutChromeShelfControllerTest
   std::unique_ptr<user_manager::ScopedUserManager> user_manager_enabler_;
 
   ProfileToNameMap created_profiles_;
+  base::test::ScopedFeatureList scoped_feature_list_;
 };
 
 class ChromeShelfControllerMultiProfileWithArcTest