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This CL fixes a few warnings reported by the clang static analyzer:
* Remove the unnecessary `next_frame += bytes_to_copy` line from
  AudioPlayerBuffer.
* Call dictionaryWithDictionary with empty dictionary if data is nil.
* Add [super viewDidLoad] calls to view controllers.

Note that none of them causes actual problem in the official app.

Bug: 791222
Change-Id: Icaaf8a43481eb68950dbf6c25c9d7789237aed5e
Reviewed-on: https://chromium-review.googlesource.com/809928
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522216}