chromeos: Clean up mash references in comments in //components/arc

Mustash/mash was shut down over a year ago. However, the checks for
ash::Shell::HasInstance() are still needed for tests.

Bug: none
Change-Id: I8164a5b36c1d77286e4a092c9a5f6c4cf33878f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225377
Auto-Submit: James Cook <jamescook@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773962}

components/arc/intent_helper/arc_intent_helper_bridge.cc

@@ -144,7 +144,6 @@ void ArcIntentHelperBridge::OnOpenDownloads() {
   // downloads by default, which is what we want.  However if it is open it will
   // simply be brought to the forgeground without forcibly being navigated to
   // downloads, which is probably not ideal.
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
   ash::NewWindowDelegate::GetInstance()->OpenFileManager();
 }
 

components/arc/power/arc_power_bridge.cc

@@ -151,7 +151,7 @@ void ArcPowerBridge::FlushWakeLocksForTesting() {
 }
 
 void ArcPowerBridge::OnConnectionReady() {
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
+  // ash::Shell may not exist in tests.
   if (ash::Shell::HasInstance())
     ash::Shell::Get()->display_configurator()->AddObserver(this);
   chromeos::PowerManagerClient::Get()->AddObserver(this);
@@ -161,7 +161,7 @@ void ArcPowerBridge::OnConnectionReady() {
 }
 
 void ArcPowerBridge::OnConnectionClosed() {
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
+  // ash::Shell may not exist in tests.
   if (ash::Shell::HasInstance())
     ash::Shell::Get()->display_configurator()->RemoveObserver(this);
   chromeos::PowerManagerClient::Get()->RemoveObserver(this);

components/arc/rotation_lock/arc_rotation_lock_bridge.cc

@@ -47,7 +47,7 @@ ArcRotationLockBridge::ArcRotationLockBridge(content::BrowserContext* context,
                                              ArcBridgeService* bridge_service)
     : arc_bridge_service_(bridge_service) {
   arc_bridge_service_->rotation_lock()->AddObserver(this);
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
+  // ash::Shell may not exist in tests.
   if (ash::Shell::HasInstance()) {
     ash::Shell::Get()->screen_orientation_controller()->AddObserver(this);
     ash::Shell::Get()->tablet_mode_controller()->AddObserver(this);
@@ -56,8 +56,7 @@ ArcRotationLockBridge::ArcRotationLockBridge(content::BrowserContext* context,
 
 ArcRotationLockBridge::~ArcRotationLockBridge() {
   arc_bridge_service_->rotation_lock()->RemoveObserver(this);
-  // TODO(mus): mus needs proper shutdown process.
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
+  // ash::Shell may not exist in tests.
   if (ash::Shell::HasInstance()) {
     ash::Shell::Get()->screen_orientation_controller()->RemoveObserver(this);
     ash::Shell::Get()->tablet_mode_controller()->RemoveObserver(this);
@@ -77,7 +76,7 @@ void ArcRotationLockBridge::OnTabletPhysicalStateChanged() {
 }
 
 void ArcRotationLockBridge::SendRotationLockState() {
-  // TODO(mash): Support this functionality without ash::Shell access in Chrome.
+  // ash::Shell may not exist in tests.
   if (!ash::Shell::HasInstance())
     return;
 

components/arc/session/arc_session_impl.cc

@@ -375,7 +375,7 @@ void ArcSessionImpl::DoStartMiniInstance(size_t num_cores_disabled) {
       base::FeatureList::IsEnabled(arc::kNativeBridgeToggleFeature);
   params.arc_file_picker_experiment =
       base::FeatureList::IsEnabled(arc::kFilePickerExperimentFeature);
-  // Enable Custom Tabs only on Dev and Cannary, and only when Mash is enabled.
+  // Enable Custom Tabs only on Dev and Canary.
   const bool is_custom_tab_enabled =
       base::FeatureList::IsEnabled(arc::kCustomTabsExperimentFeature) &&
       delegate_->GetChannel() != version_info::Channel::STABLE &&