mac: Don't show "Access Address Book" prompt if Autofill is disabled.

components/autofill/core/browser/autofill_manager.h

Index: components/autofill/core/browser/autofill_manager.h
diff --git a/components/autofill/core/browser/autofill_manager.h b/components/autofill/core/browser/autofill_manager.h
index 72454ed22bb4a9d355774c2213c8fcab3f2788c0..43668bba0d5376393c62c13d2cc785b404b3ad7e 100644
--- a/components/autofill/core/browser/autofill_manager.h
+++ b/components/autofill/core/browser/autofill_manager.h
@@ -237,8 +237,9 @@ class AutofillManager : public AutofillDownloadManager::Observer {
 
   // Fills |form_structure| and |autofill_field| with the cached elements
   // corresponding to |form| and |field|.  This might have the side-effect of
-  // updating the cache.  Returns false if the |form| is not autofillable, or if
-  // it is not already present in the cache and the cache is full.
+  // updating the cache.  Returns false if the |form| has no autofillable
+  // fields, or if it is not already present in the cache and the cache is
+  // full.
   bool GetCachedFormAndField(const FormData& form,
                              const FormFieldData& field,
                              FormStructure** form_structure,