Bazel: Remove re-definiton of objenesis dependency

This dependency was accidentally duplicated in I72c0694ec6f, where new
version as a transitive dependency of Mockito library was added, but
the old one was forgotten to be removed.

Change-Id: I57d1b1e007e462bd65aee84e7267a46674f50ac0
diff --git a/WORKSPACE b/WORKSPACE
index 5e5eb80..754231d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -907,12 +907,6 @@
     sha1 = "92bf48723d277d6efd1150b2f7e9e1e92cb56caf",
 )
 
-maven_jar(
-    name = "objenesis",
-    artifact = "org.objenesis:objenesis:1.3",
-    sha1 = "dc13ae4faca6df981fc7aeb5a522d9db446d5d50",
-)
-
 POWERM_VERS = "1.6.1"
 
 maven_jar(