Create setting that disables password stores

components/os_crypt/key_storage_linux.h

Index: components/os_crypt/key_storage_linux.h
diff --git a/components/os_crypt/key_storage_linux.h b/components/os_crypt/key_storage_linux.h
index 394b6b38173be0b67fa890974ba40e6fcab08ac1..310b40f25765451e2d8f571b45aa196786ff96dd 100644
--- a/components/os_crypt/key_storage_linux.h
+++ b/components/os_crypt/key_storage_linux.h
@@ -12,6 +12,7 @@
 #include "base/memory/ref_counted.h"
 
 namespace base {
+class FilePath;
 class SingleThreadTaskRunner;
 }  // namespace base
 
@@ -34,6 +35,12 @@ class KeyStorageLinux {
   static void SetMainThreadRunner(
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
 
+  // Controls whether preference on using or ignoring backends is used.
+  static void ShouldUsePreference(bool should_use_preference);
+
+  // Preferences are stored in a separate file in the user data directory.
+  static void SetUserDataPath(const base::FilePath& path);
+
   // Tries to load the appropriate key storage. Returns null if none succeed.
   static std::unique_ptr<KeyStorageLinux> CreateService();