[Sync] Move keystore key handling to SyncEncryptionHandlerImpl

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 7899854b99867fca798482dcd1c8e6667fbf3dd4..082f607953c487f51ec4c4178fae61d28b47c2c0 100644
--- a/sync/test/fake_sync_encryption_handler.h
+++ b/sync/test/fake_sync_encryption_handler.h
@@ -46,6 +46,11 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
   virtual void UpdateNigoriFromEncryptedTypes(
       sync_pb::NigoriSpecifics* nigori,
       syncable::BaseTransaction* const trans) const OVERRIDE;
+  virtual bool NeedKeystoreKey(
+      syncable::BaseTransaction* const trans) const OVERRIDE;
+  virtual bool SetKeystoreKey(
+      const std::string& key,
+      syncable::BaseTransaction* const trans) OVERRIDE;
   virtual ModelTypeSet GetEncryptedTypes(
       syncable::BaseTransaction* const trans) const OVERRIDE;
 
@@ -59,6 +64,7 @@ class FakeSyncEncryptionHandler : public SyncEncryptionHandler,
 
   FakeEncryptor encryptor_;
   Cryptographer cryptographer_;
+  std::string keystore_key_;
 };
 
 }  // namespace syncer