Make PutHttpPassword singleton

All class members are singletons / providers, hence this class can be a
singleton.

Change-Id: If8072a01815a2c57a93b910fa7356dd5f621759b
Signed-off-by: Edwin Kempin <ekempin@google.com>

java/com/google/gerrit/server/restapi/account/PutHttpPassword.java

diff --git a/java/com/google/gerrit/server/restapi/account/PutHttpPassword.java b/java/com/google/gerrit/server/restapi/account/PutHttpPassword.java
index 02f59ac..d671ebf 100644
--- a/java/com/google/gerrit/server/restapi/account/PutHttpPassword.java
+++ b/java/com/google/gerrit/server/restapi/account/PutHttpPassword.java
@@ -40,6 +40,7 @@
 import com.google.gwtorm.server.OrmException;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
+import com.google.inject.Singleton;
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
@@ -47,6 +48,7 @@
 import org.apache.commons.codec.binary.Base64;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 
+@Singleton
 public class PutHttpPassword implements RestModifyView<AccountResource, HttpPasswordInput> {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();