GDT remove @import (#6178)

Author: paulb777

GoogleDataTransport/GDTCORLibrary/Internal/GoogleDataTransportInternal.h

@@ -15,8 +15,4 @@
 // An umbrella header, for any other libraries in this repo to access Firebase Public and Private
 // headers. Any package manager complexity should be handled here.
 
-#if SWIFT_PACKAGE
-@import GoogleDataTransport;
-#else
 #import <GoogleDataTransport/GoogleDataTransport.h>
-#endif

scripts/check_imports.swift

@@ -81,7 +81,9 @@ private func checkFile(_ file: String, logger: ErrorLogger, inRepo repoURL: URL)
     file.range(of: "GDTCCTLibrary/Public/GDTCOREvent+GDTCCTSupport.h") == nil
   let isPrivate = file.range(of: "/Sources/Private/") != nil ||
     // Delete when FirebaseInstallations fixes directory structure.
-    file.range(of: "Source/Library/Private/") != nil
+    file.range(of: "Source/Library/Private/") != nil ||
+    // Delete when GDT fixes directory structure.
+    file.range(of: "GDTCORLibrary/Internal/") != nil
   var inSwiftPackage = false
   var inSwiftPackageElse = false
   let lines = fileContents.components(separatedBy: .newlines)