Change import format

Author: andrewheard

FirebaseAppCheck/Sources/Core/FIRAppCheckSettings.h

@@ -16,7 +16,7 @@
 
 #import <Foundation/Foundation.h>
 
-#import <AppCheck/AppCheck.h>
+@import AppCheck;
 
 @class FIRApp;
 

FirebaseAppCheck/Sources/Core/TokenRefresh/FIRAppCheckTokenRefresher.m

@@ -16,7 +16,7 @@
 
 #import "FirebaseAppCheck/Sources/Core/TokenRefresh/FIRAppCheckTokenRefresher.h"
 
-#import <AppCheck/AppCheck.h>
+@import AppCheck;
 
 #import "FirebaseAppCheck/Sources/Core/TokenRefresh/FIRAppCheckTimer.h"
 #import "FirebaseAppCheck/Sources/Core/TokenRefresh/FIRAppCheckTokenRefreshResult.h"

FirebaseAppCheck/Tests/Unit/Core/FIRAppCheckTokenRefresherTests.m

@@ -16,7 +16,8 @@
 
 #import <XCTest/XCTest.h>
 
-#import <AppCheck/AppCheck.h>
+@import AppCheck;
+
 #import <OCMock/OCMock.h>
 
 #import "FirebaseAppCheck/Sources/Core/TokenRefresh/FIRAppCheckTokenRefreshResult.h"