[Sync] Refactor passphrase state handling

sync/test/fake_sync_encryption_handler.h

Index: sync/test/fake_sync_encryption_handler.h
diff --git a/sync/test/fake_sync_encryption_handler.h b/sync/test/fake_sync_encryption_handler.h
index 7456a0829e73b2c13dd1dfc32cbc2a94e719ffcd..7899854b99867fca798482dcd1c8e6667fbf3dd4 100644
--- a/sync/test/fake_sync_encryption_handler.h
+++ b/sync/test/fake_sync_encryption_handler.h
@@ -37,7 +37,7 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
   virtual void SetDecryptionPassphrase(const std::string& passphrase) OVERRIDE;
   virtual void EnableEncryptEverything() OVERRIDE;
   virtual bool EncryptEverythingEnabled() const OVERRIDE;
-  virtual bool IsUsingExplicitPassphrase() const OVERRIDE;
+  virtual PassphraseState GetPassphraseState() const OVERRIDE;
 
   // NigoriHandler implemenation.
   virtual void ApplyNigoriUpdate(
@@ -55,7 +55,7 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
   ObserverList<SyncEncryptionHandler::Observer> observers_;
   ModelTypeSet encrypted_types_;
   bool encrypt_everything_;
-  bool explicit_passphrase_;
+  PassphraseState passphrase_state_;
 
   FakeEncryptor encryptor_;
   Cryptographer cryptographer_;