FIRErrorCodeDurableDeepLinkFailed is for 3P only (#2797)

* FIRErrorCodeDurableDeepLinkFailed is for 3P only
* import is also 3P only

Author: paulb777

Firebase/DynamicLinks/FIRDynamicLinks.m

@@ -29,7 +29,9 @@
 #import "DynamicLinks/FIRDLScionLogging.h"
 #endif
 
+#ifdef FIRDynamicLinks3P
 #import "DynamicLinks/FDLURLComponents/FDLURLComponents+Private.h"
+#endif
 #import "DynamicLinks/FIRDLRetrievalProcessFactory.h"
 #import "DynamicLinks/FIRDLRetrievalProcessProtocols.h"
 #import "DynamicLinks/FIRDLRetrievalProcessResult.h"
@@ -56,9 +58,6 @@
 NSString *const kFIRDLReadDeepLinkAfterInstallKey =
     @"com.google.appinvite.readDeeplinkAfterInstall";
 
-// Error code from FDL.
-static const NSInteger FIRErrorCodeDurableDeepLinkFailed = -119;
-
 // We should only open url once. We use the following key to store the state in the user defaults.
 static NSString *const kFIRDLOpenURLKey = @"com.google.appinvite.openURL";
 
@@ -86,6 +85,9 @@ @interface FIRDynamicLinks () <FIRDLRetrievalProcessDelegate>
 @end
 
 #ifdef FIRDynamicLinks3P
+// Error code from FDL.
+static const NSInteger FIRErrorCodeDurableDeepLinkFailed = -119;
+
 @interface FIRDynamicLinks () {
   /// Stored Analytics reference, if it exists.
   id<FIRAnalyticsInterop> _Nullable _analytics;