[Autofill] Fix duplicate definition of kIbanValue

This is causing compilation errors on ChromeOS because
chrome/browser/ui/views/autofill/payments/iban_bubble_view_uitest.cc
and components/autofill/core/browser/autofill_test_utils.h both
define `kIbanValue`.

Bug: 1007974
Change-Id: I2c4fa99462bedec644cf09624ab82601ccf21a36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4350451
Reviewed-by: Michael Lerman <mlerman@chromium.org>
Commit-Queue: Christoph Schwering <schwering@google.com>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1119104}

components/autofill/core/browser/autofill_test_utils.h

@@ -28,10 +28,6 @@
 
 class PrefService;
 
-namespace {
-constexpr char kIbanValue[] = "IE64 IRCE 9205 0112 3456 78";
-}  // namespace
-
 namespace user_prefs {
 class PrefRegistrySyncable;
 }  // namespace user_prefs
@@ -264,7 +260,7 @@ void CreateTestCreditCardFormData(FormData* form,
 // single IBAN field). Note that this actually appends fields to the form data,
 // which can be useful for building up more complex test forms.
 void CreateTestIbanFormData(FormData* form_data,
-                            const char* value = kIbanValue);
+                            const char* value = "IE64 IRCE 9205 0112 3456 78");
 
 // Strips those members from |form| and |field| that are not serialized via
 // mojo, i.e., resets them to `{}`.