Update Toolbar View ephemeral Guest profile test.

ToolbarViewWithExtensionsToolbarMenuTest did not correctly disable
Ephemeral Guest profiles when they were enabled by default.
This issue is fixed.

Bug: 1125474
Change-Id: I4f277c3477d76cf3fee51bcd80c283b2929e2ea5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573104Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834173}

chrome/browser/ui/views/toolbar/toolbar_view_interactive_uitest.cc

@@ -359,10 +359,9 @@ class GuestToolbarViewWithExtensionsToolbarMenuTest
  public:
   GuestToolbarViewWithExtensionsToolbarMenuTest() : is_ephemeral_(GetParam()) {
     // Update for platforms which don't support ephemeral Guest profiles.
-    if (is_ephemeral_) {
-      is_ephemeral_ =
-          TestingProfile::SetScopedFeatureListForEphemeralGuestProfiles(
-              scoped_feature_list_, is_ephemeral_);
+    if (!TestingProfile::SetScopedFeatureListForEphemeralGuestProfiles(
+            scoped_feature_list_, is_ephemeral_)) {
+      is_ephemeral_ = false;
     }
   }