Create setting that disables password stores

components/os_crypt/os_crypt.h

Index: components/os_crypt/os_crypt.h
diff --git a/components/os_crypt/os_crypt.h b/components/os_crypt/os_crypt.h
index b03d72608d6bbee16dba5b375a4de6e45e8cf7d1..e8b88cdbb444fb9af0d949eace8b2cd04c27fcce 100644
--- a/components/os_crypt/os_crypt.h
+++ b/components/os_crypt/os_crypt.h
@@ -17,6 +17,10 @@
 #include "components/os_crypt/key_storage_linux.h"
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
+namespace base {
+class FilePath;
+}
+
 // The OSCrypt class gives access to simple encryption and decryption of
 // strings. Note that on Mac, access to the system Keychain is required and
 // these calls can block the current thread to collect user input. The same is
@@ -39,6 +43,13 @@ class OSCrypt {
   static void SetMainThreadRunner(
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
 
+  // Enable the feature where we determine if we should try a backend via a
+  // preference file.
+  static void EnablePreference(bool enable_preference);
+
+  // Set the folder, where OSCrypt will check for its preference file.
+  static void SetUserDataPath(const base::FilePath& path);
+
   // Returns true iff the real secret key (not hardcoded one) is available.
   static bool IsEncryptionAvailable();
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)