message: 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.
diff: @@ -1300,7 +1300,6 @@ def zeros(shape, dtype=None, name=None):
  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 @@ def ones(shape, dtype=None, name=None):
  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
  