[Messaging] Cleanup compilation guards for building on older SDKs (#12935)

Author: ncooke3

FirebaseMessaging/Sources/FIRMessaging.m

@@ -49,13 +49,8 @@
 static NSString *const kFIRMessagingMessageViaAPNSRootKey = @"aps";
 static NSString *const kFIRMessagingReachabilityHostname = @"www.google.com";
 
-#if defined(__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
 const NSNotificationName FIRMessagingRegistrationTokenRefreshedNotification =
     @"com.firebase.messaging.notif.fcm-token-refreshed";
-#else
-NSString *const FIRMessagingRegistrationTokenRefreshedNotification =
-    @"com.firebase.messaging.notif.fcm-token-refreshed";
-#endif  // defined(__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
 
 NSString *const kFIRMessagingUserDefaultsKeyAutoInitEnabled =
     @"com.firebase.messaging.auto-init.enabled";  // Auto Init Enabled key stored in NSUserDefaults

FirebaseMessaging/Sources/FIRMessagingContextManagerService.m

@@ -13,11 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 ||                                          \
-    __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14 || __TV_OS_VERSION_MAX_ALLOWED >= __TV_10_0 || \
-    __WATCH_OS_VERSION_MAX_ALLOWED >= __WATCHOS_3_0 || TARGET_OS_MACCATALYST
+
 #import <UserNotifications/UserNotifications.h>
-#endif
 
 #import "FirebaseMessaging/Sources/FIRMessagingContextManagerService.h"
 

FirebaseMessaging/Tests/UnitTests/FIRMessagingContextManagerServiceTest.m

@@ -13,12 +13,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 ||                                          \
-    __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14 || __TV_OS_VERSION_MAX_ALLOWED >= __TV_10_0 || \
-    __WATCH_OS_VERSION_MAX_ALLOWED >= __WATCHOS_3_0 || TARGET_OS_MACCATALYST
-#import <UserNotifications/UserNotifications.h>
-#endif
+
 #import <OCMock/OCMock.h>
+#import <UserNotifications/UserNotifications.h>
 #import <XCTest/XCTest.h>
 
 #import "FirebaseMessaging/Sources/FIRMessagingContextManagerService.h"

FirebaseMessaging/Tests/UnitTests/FIRMessagingRemoteNotificationsProxyTest.m

@@ -14,11 +14,8 @@
  * limitations under the License.
  */
 
-#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 || \
-    __TV_OS_VERSION_MAX_ALLOWED >= __TV_10_0 || __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14
-#import <UserNotifications/UserNotifications.h>
-#endif
 #import <OCMock/OCMock.h>
+#import <UserNotifications/UserNotifications.h>
 #import <XCTest/XCTest.h>
 
 #import <GoogleUtilities/GULAppDelegateSwizzler.h>
@@ -95,8 +92,6 @@ - (void)application:(GULApplication *)application
 
 @end
 
-#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 || \
-    __TV_OS_VERSION_MAX_ALLOWED >= __TV_10_0 || __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14
 #pragma mark - Incompete UNUserNotificationCenterDelegate
 @interface IncompleteUserNotificationCenterDelegate : NSObject <UNUserNotificationCenterDelegate>
 @end
@@ -127,8 +122,6 @@ - (void)userNotificationCenter:(UNUserNotificationCenter *)center
 #endif
 @end
 
-#endif
-
 @interface GULAppDelegateSwizzler (FIRMessagingRemoteNotificationsProxyTest)
 + (void)resetProxyOriginalDelegateOnceToken;
 @end