Enable compilation of //components/autofill on iOS with gn.

components/autofill/core/browser/autofill_field_trial_ios.h

Index: components/autofill/core/browser/autofill_field_trial_ios.h
diff --git a/components/autofill/ios/browser/autofill_field_trial_ios.h b/components/autofill/core/browser/autofill_field_trial_ios.h
similarity index 79%
rename from components/autofill/ios/browser/autofill_field_trial_ios.h
rename to components/autofill/core/browser/autofill_field_trial_ios.h
index cb5d3cb9fdffa8f97247c19d42856f39b807a376..9750b7135d91527725b49a1ca488a8674a80b83b 100644
--- a/components/autofill/ios/browser/autofill_field_trial_ios.h
+++ b/components/autofill/core/browser/autofill_field_trial_ios.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_AUTOFILL_IOS_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_
-#define COMPONENTS_AUTOFILL_IOS_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_
+#ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_
+#define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_
 
 #include "base/macros.h"
 
@@ -25,4 +25,4 @@ class AutofillFieldTrialIOS {
 
 }  // namespace autofill
 
-#endif  // COMPONENTS_AUTOFILL_IOS_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_
+#endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_FIELD_TRIAL_IOS_H_