chore: cleanup arc migration helpers (#39606)

shell/browser/ui/cocoa/delayed_native_view_host.mm

@@ -6,10 +6,6 @@
 #include "base/apple/owned_objc.h"
 #include "shell/browser/ui/cocoa/electron_inspectable_web_contents_view.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 namespace electron {
 
 DelayedNativeViewHost::DelayedNativeViewHost(gfx::NativeView native_view)

shell/browser/ui/cocoa/electron_inspectable_web_contents_view.h

@@ -12,10 +12,6 @@
 #include "chrome/browser/devtools/devtools_contents_resizing_strategy.h"
 #include "ui/base/cocoa/base_view.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 namespace electron {
 class InspectableWebContentsViewMac;
 }

shell/browser/ui/cocoa/electron_inspectable_web_contents_view.mm

@@ -13,10 +13,6 @@
 #include "ui/base/cocoa/base_view.h"
 #include "ui/gfx/mac/scoped_cocoa_disable_screen_updates.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 @implementation ElectronInspectableWebContentsView
 
 - (instancetype)initWithInspectableWebContentsViewMac:

shell/browser/ui/cocoa/electron_menu_controller.h

@@ -11,10 +11,6 @@
 #include "base/functional/callback.h"
 #include "base/memory/weak_ptr.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 namespace electron {
 class ElectronMenuModel;
 }

shell/browser/ui/cocoa/electron_ns_window.mm

@@ -14,10 +14,6 @@
 #import <objc/message.h>
 #import <objc/runtime.h>
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 namespace electron {
 
 int ScopedDisableResize::disable_resize_ = 0;

shell/browser/ui/cocoa/electron_ns_window_delegate.mm

@@ -17,10 +17,6 @@
 #include "ui/views/cocoa/native_widget_mac_ns_window_host.h"
 #include "ui/views/widget/native_widget_mac.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 using TitleBarStyle = electron::NativeWindowMac::TitleBarStyle;
 using FullScreenTransitionState =
     electron::NativeWindow::FullScreenTransitionState;

shell/browser/ui/cocoa/electron_touch_bar.h

@@ -15,10 +15,6 @@
 #include "shell/browser/native_window.h"
 #include "shell/common/gin_helper/persistent_dictionary.h"
 
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
 @interface ElectronTouchBar : NSObject <NSScrubberDelegate,
                                         NSScrubberDataSource,
                                         NSScrubberFlowLayoutDelegate> {