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Improve media::AudioRendererImplTest correctness via helper types.

While writing some new tests I ran into some hard to track down failures
that were a result of:
  1) Using AudioBufferConverter due to different input/output rates
  2) Using "int" for all input/output frame counts

For example, DeliverRemainingAudio() would actually over-deliver since
it didn't take the ratio of input/output rates into account.

To help make things better, use the type system to differentiate between
input and output frame counts. In addition, use simpler input/output
rates to make it easier to calculate expected time and frame values.

BUG=370634

Review URL: https://codereview.chromium.org/403003004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284529 0039d316-1c4b-4281-b951-d872f2087c98