Clean up LappedTransform and Blocker.

  - Remove unnecessary window member from lapped_transform.
  - Add comment indicated that Blocker does not take ownership of
    the window passed to its constructor.
  - Streamline LappedTransform constructor so members can be const.

Also use a range-based for loop in audio_processing_impl.cc for clarity.

R=aluebs@webrtc.org, andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41229004

Cr-Commit-Position: refs/heads/master@{#8708}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8708 4adac7df-926f-26a2-2b94-8c16560cd09d
7 files changed