[Sync] Split encryption state and logic out of PSS and SBHI.

components/sync/engine/fake_sync_engine.cc

Index: components/sync/engine/fake_sync_engine.cc
diff --git a/components/sync/engine/fake_sync_engine.cc b/components/sync/engine/fake_sync_engine.cc
index 8b35a10e50204c6c5c916652a68e742b8a24df1e..b19d28b08085a73d0dd4cd95b00ea9e729be2ac2 100644
--- a/components/sync/engine/fake_sync_engine.cc
+++ b/components/sync/engine/fake_sync_engine.cc
@@ -31,9 +31,7 @@ void FakeSyncEngine::StartSyncingWithServer() {}
 void FakeSyncEngine::SetEncryptionPassphrase(const std::string& passphrase,
                                              bool is_explicit) {}
 
-bool FakeSyncEngine::SetDecryptionPassphrase(const std::string& passphrase) {
-  return false;
-}
+void FakeSyncEngine::SetDecryptionPassphrase(const std::string& passphrase) {}
 
 void FakeSyncEngine::StopSyncingForShutdown() {}
 
@@ -72,18 +70,6 @@ bool FakeSyncEngine::HasUnsyncedItems() const {
   return false;
 }
 
-bool FakeSyncEngine::IsNigoriEnabled() const {
-  return true;
-}
-
-PassphraseType FakeSyncEngine::GetPassphraseType() const {
-  return PassphraseType::IMPLICIT_PASSPHRASE;
-}
-
-base::Time FakeSyncEngine::GetExplicitPassphraseTime() const {
-  return base::Time();
-}
-
 bool FakeSyncEngine::IsCryptographerReady(const BaseTransaction* trans) const {
   return false;
 }