Move Apple retained platform state into platform target

src/platform_legacy/legacy_platform_state.h

@@ -1,22 +1,11 @@
 #pragma once
 
-#include "platform_apple/apple_platform_services.h"
 #include "platform_api/platform_services.h"
 
 #if __LINUX__ || __WEB__
 struct GLFWwindow;
 #endif
 
-#if defined(__OBJC__) && defined(__IOS__)
-@class GameViewController;
-@class AppDelegate;
-#endif
-
-#if defined(__OBJC__) && defined(__OSX__)
-@class View;
-@class AppOSX;
-#endif
-
 namespace pp::platform::legacy {
 
 #if defined(__LINUX__) || defined(__WEB__)
@@ -36,32 +25,6 @@ struct RetainedLegacyGlfwWindowState final {
 void set_legacy_glfw_window(GLFWwindow* window);
 #endif
 
-#if defined(__IOS__) || defined(__OSX__)
-struct RetainedLegacyAppleState final {
-#ifdef __IOS__
-    GameViewController* ios_view = nullptr;
-    AppDelegate* ios_app = nullptr;
-#elif defined(__OSX__)
-    View* osx_view = nullptr;
-    AppOSX* osx_app = nullptr;
-#endif
-};
-
-[[nodiscard]] RetainedLegacyAppleState& active_legacy_apple_state();
-[[nodiscard]] pp::platform::apple::AppleDocumentPlatformServices&
-active_legacy_apple_document_platform_services();
-[[nodiscard]] pp::platform::PlatformStoragePaths prepare_legacy_apple_storage_paths();
-void set_legacy_apple_state(
-#ifdef __IOS__
-    GameViewController* ios_view,
-    AppDelegate* ios_app
-#elif defined(__OSX__)
-    View* osx_view,
-    AppOSX* osx_app
-#endif
-);
-#endif
-
 [[nodiscard]] pp::platform::WebPlatformServices& active_legacy_web_platform_services();
 
 [[nodiscard]] const pp::platform::PlatformStoragePaths& active_legacy_storage_paths();