Discourage creation of Java infobars without InfoBarDelegates

components/infobars/core/BUILD.gn

Index: components/infobars/core/BUILD.gn
diff --git a/components/infobars/core/BUILD.gn b/components/infobars/core/BUILD.gn
index ed68337904a101558a9558a24e1ebf07e2cf8d92..89eca852f70bf6c6943f1af93081c3cfe578fb16 100644
--- a/components/infobars/core/BUILD.gn
+++ b/components/infobars/core/BUILD.gn
@@ -4,6 +4,11 @@
 
 import("//build/config/ui.gni")
 
+if (is_android) {
+  import("//build/config/android/config.gni")
+  import("//build/config/android/rules.gni")
+}
+
 static_library("core") {
   sources = [
     "confirm_infobar_delegate.cc",
@@ -37,3 +42,12 @@ static_library("core") {
     deps += [ "//ui/native_theme" ]
   }
 }
+
+if (is_android) {
+  # GYP: //components/infobars.gypi:infobar_delegate_java
+  java_cpp_enum("infobar_enums_java") {
+    sources = [
+      "infobar_delegate.h",
+    ]
+  }
+}