Replace usages of DEPRECATED_java_in_dir with java_files

components/variations/android/BUILD.gn

Index: components/variations/android/BUILD.gn
diff --git a/components/variations/android/BUILD.gn b/components/variations/android/BUILD.gn
index 576db64f7eb6d8a4acf12ebf96e05829d1fce75d..0bcadfddab067bfa2f6ee250850e4c3f7b4834d5 100644
--- a/components/variations/android/BUILD.gn
+++ b/components/variations/android/BUILD.gn
@@ -9,5 +9,10 @@ android_library("variations_java") {
   deps = [
     "//base:base_java",
   ]
-  DEPRECATED_java_in_dir = "java/src"
+  java_files = [
+    "java/src/org/chromium/components/variations/VariationsAssociatedData.java",
+    "java/src/org/chromium/components/variations/firstrun/VariationsSeedBridge.java",
+    "java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java",
+    "java/src/org/chromium/components/variations/firstrun/VariationsSeedServiceLauncher.java",
+  ]
 }