am e7b92d7b: Merge "Return immutable copies of private callList." into gingerbread

Merge commit 'e7b92d7b53343119173558302ecfb3986ae0fbd6' into gingerbread-plus-aosp

* commit 'e7b92d7b53343119173558302ecfb3986ae0fbd6':
  Return immutable copies of private callList.