Remove FIRAppCheckProtocol from FirebaseAppCheckInterop SDK (#13263)

Author: andrewheard

FirebaseAppCheck/Interop/Public/FirebaseAppCheckInterop/FIRAppCheckProtocol.h

@@ -15,6 +15,4 @@
  */
 
 #import "FIRAppCheckInterop.h"
-#import "FIRAppCheckProtocol.h"
-#import "FIRAppCheckTokenProtocol.h"
 #import "FIRAppCheckTokenResultInterop.h"

FirebaseAppCheck/Interop/Public/FirebaseAppCheckInterop/FIRAppCheckTokenProtocol.h

@@ -16,8 +16,6 @@
 
 #import <Foundation/Foundation.h>
 
-#import <FirebaseAppCheckInterop/FirebaseAppCheckInterop.h>
-
 @class FIRApp;
 @class FIRAppCheckToken;
 @protocol FIRAppCheckProviderFactory;
@@ -38,7 +36,7 @@ FOUNDATION_EXPORT NSString *const kFIRAppCheckAppNameNotificationKey NS_SWIFT_NA
 
 /// A class used to manage app check tokens for a given Firebase app.
 NS_SWIFT_NAME(AppCheck)
-@interface FIRAppCheck : NSObject <FIRAppCheckProtocol>
+@interface FIRAppCheck : NSObject
 
 - (instancetype)init NS_UNAVAILABLE;
 

FirebaseAppCheck/Interop/Public/FirebaseAppCheckInterop/FirebaseAppCheckInterop.h

@@ -16,13 +16,11 @@
 
 #import <Foundation/Foundation.h>
 
-#import <FirebaseAppCheckInterop/FirebaseAppCheckInterop.h>
-
 NS_ASSUME_NONNULL_BEGIN
 
 /// An object representing a Firebase App Check token.
 NS_SWIFT_NAME(AppCheckToken)
-@interface FIRAppCheckToken : NSObject <FIRAppCheckTokenProtocol>
+@interface FIRAppCheckToken : NSObject
 
 /// A Firebase App Check token.
 @property(nonatomic, readonly) NSString *token;