kill RCTFabricSurfaceHostingProxyRootView (#38864)

Summary:
Pull Request resolved: #38864

## Changelog:

[iOS][Breaking] - Deleting RCTFabricSurfaceHostingProxyRootView

We currently have 3 different container view classes in new architecture: `RCTFabricSurfaceHostingProxyRootView`, `RCTSurfaceHostingProxyRootView`, and `RCTSurfaceHostingView`. it's a little complicated for the current use case, so there's an opportunity to simplify.

in this PR, i get rid of `RCTFabricSurfaceHostingProxyRootView` by relying on the composable behavior of surface and host views instead of existing internal reflection logic that depends on inheritance. these are cleaned up in D48140101 and D48140317.

i checked GH search and no one is really using this in a fundamental way.

bypass-github-export-checks

Reviewed By: cipolleschi

Differential Revision: D48139820

fbshipit-source-id: 068b994a8b068a4107397f1862356b8fa1da961f

packages/react-native/Libraries/AppDelegate/RCTAppDelegate.mm

@@ -17,7 +17,6 @@
 #import <React/RCTComponentViewProtocol.h>
 #import <React/RCTCxxBridgeDelegate.h>
 #import <React/RCTFabricSurface.h>
-#import <React/RCTFabricSurfaceHostingProxyRootView.h>
 #import <React/RCTLegacyViewManagerInteropComponentView.h>
 #import <React/RCTSurfaceHostingProxyRootView.h>
 #import <React/RCTSurfacePresenter.h>

packages/react-native/Libraries/AppDelegate/RCTAppSetupUtils.mm

@@ -20,7 +20,8 @@
 #import <React/RCTNetworking.h>
 
 // Fabric
-#import <React/RCTFabricSurfaceHostingProxyRootView.h>
+#import <React/RCTFabricSurface.h>
+#import <React/RCTSurfaceHostingProxyRootView.h>
 #import <react/renderer/runtimescheduler/RuntimeScheduler.h>
 #import <react/renderer/runtimescheduler/RuntimeSchedulerBinding.h>
 #endif
@@ -68,9 +69,10 @@ void RCTAppSetupPrepareApp(UIApplication *application, BOOL turboModuleEnabled)
 {
 #if RCT_NEW_ARCH_ENABLED
   if (fabricEnabled) {
-    return [[RCTFabricSurfaceHostingProxyRootView alloc] initWithBridge:bridge
-                                                             moduleName:moduleName
-                                                      initialProperties:initialProperties];
+    id<RCTSurfaceProtocol> surface = [[RCTFabricSurface alloc] initWithBridge:bridge
+                                                                   moduleName:moduleName
+                                                            initialProperties:initialProperties];
+    return [[RCTSurfaceHostingProxyRootView alloc] initWithSurface:surface];
   }
 #endif
   return [[RCTRootView alloc] initWithBridge:bridge moduleName:moduleName initialProperties:initialProperties];

packages/react-native/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingProxyRootView.h

@@ -58,6 +58,8 @@ NS_ASSUME_NONNULL_BEGIN
                 sizeMeasureMode:(RCTSurfaceSizeMeasureMode)sizeMeasureMode
                  moduleRegistry:(RCTModuleRegistry *)moduleRegistry;
 
+- (instancetype)initWithSurface:(id<RCTSurfaceProtocol>)surface;
+
 - (void)cancelTouches;
 
 @end

packages/react-native/React/Base/Surface/SurfaceHostingView/RCTSurfaceHostingProxyRootView.mm

@@ -104,6 +104,15 @@ - (instancetype)initWithSurface:(id<RCTSurfaceProtocol>)surface
   return self;
 }
 
+- (instancetype)initWithSurface:(id<RCTSurfaceProtocol>)surface
+{
+  if (self = [super initWithSurface:surface
+                    sizeMeasureMode:RCTSurfaceSizeMeasureModeWidthExact | RCTSurfaceSizeMeasureModeHeightExact]) {
+    [surface start];
+  }
+  return self;
+}
+
 - (BOOL)hasBridge
 {
   return _bridge != nil;