Remove variable tracking from `zeros` and `ones` keras.backend functions.

If these functions creates a new variable, `variable` function called from each of these functions already tracks that.

PiperOrigin-RevId: 286942519
Change-Id: I55f9605b33b258df3fd65b4dac10415db183b680
diff --git a/tensorflow/python/keras/backend.py b/tensorflow/python/keras/backend.py
index f1e199e..9678752 100644
--- a/tensorflow/python/keras/backend.py
+++ b/tensorflow/python/keras/backend.py
@@ -1300,7 +1300,6 @@
     v = array_ops.zeros(shape=shape, dtype=tf_dtype, name=name)
     if py_all(v.shape.as_list()):
       return variable(v, dtype=dtype, name=name)
-    track_variable(v)
     return v
 
 
@@ -1335,7 +1334,6 @@
     v = array_ops.ones(shape=shape, dtype=tf_dtype, name=name)
     if py_all(v.shape.as_list()):
       return variable(v, dtype=dtype, name=name)
-    track_variable(v)
     return v