Remove AssistantVisibility::kHidden.

Bug: b:148080975
Change-Id: I538b8b2af8cd4df5e7efc276b769c8009c942006
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036351Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#737937}

ash/app_list/app_list_controller_impl.cc

@@ -838,9 +838,6 @@ void AppListControllerImpl::OnUiVisibilityChanged(
       // changed to visible by this point.
       presenter_.SetViewVisibility(true);
       break;
-    case AssistantVisibility::kHidden:
-      NOTREACHED();
-      break;
     case AssistantVisibility::kClosed:
       if (!IsShowingEmbeddedAssistantUI())
         break;

ash/assistant/assistant_interaction_controller.cc

@@ -273,15 +273,6 @@ void AssistantInteractionController::OnUiVisibilityChanged(
       model_.ClearInteraction();
       model_.SetInputModality(GetDefaultInputModality());
       break;
-    case AssistantVisibility::kHidden:
-      // When the UI is hidden we stop any voice query in progress so that we
-      // don't listen to the user while not visible. We also restore the default
-      // input modality for the next launch.
-      if (model_.pending_query().type() == AssistantQueryType::kVoice) {
-        StopActiveInteraction(false);
-      }
-      model_.SetInputModality(GetDefaultInputModality());
-      break;
     case AssistantVisibility::kVisible:
       OnUiVisible(entry_point.value());
       break;

ash/assistant/assistant_notification_controller.cc

@@ -145,7 +145,6 @@ void AssistantNotificationController::OnUiVisibilityChanged(
         model_.AddOrUpdateNotification(std::move(update));
       }
       break;
-    case AssistantVisibility::kHidden:
     case AssistantVisibility::kClosed:
       // When the Assistant UI is no longer visible to the user we remove any
       // notifications of type |kInAssistant| as this type of notification does

ash/assistant/model/assistant_ui_model.cc

@@ -34,11 +34,6 @@ void AssistantUiModel::SetVisible(AssistantEntryPoint entry_point) {
                 /*exit_point=*/base::nullopt);
 }
 
-void AssistantUiModel::SetHidden(AssistantExitPoint exit_point) {
-  SetVisibility(AssistantVisibility::kHidden,
-                /*entry_point=*/base::nullopt, exit_point);
-}
-
 void AssistantUiModel::SetClosed(AssistantExitPoint exit_point) {
   SetVisibility(AssistantVisibility::kClosed,
                 /*entry_point=*/base::nullopt, exit_point);

ash/assistant/model/assistant_ui_model.h

@@ -24,7 +24,6 @@ enum class AssistantUiMode {
 // Enumeration of Assistant visibility states.
 enum class AssistantVisibility {
   kClosed,   // Assistant UI is hidden and the previous session has finished.
-  kHidden,   // Assistant UI is hidden and the previous session is paused.
   kVisible,  // Assistant UI is visible and a session is in progress.
 };
 
@@ -64,7 +63,6 @@ class COMPONENT_EXPORT(ASSISTANT_MODEL) AssistantUiModel {
 
   // Sets the UI visibility.
   void SetVisible(AssistantEntryPoint entry_point);
-  void SetHidden(AssistantExitPoint exit_point);
   void SetClosed(AssistantExitPoint exit_point);
 
   AssistantVisibility visibility() const { return visibility_; }