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Revert of Used native deinterleaved and float point format for the input streams. (patchset #5 of https://codereview.chromium.org/501823002/)

Reason for revert:
It broke the mac asan bot, http://build.chromium.org/p/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/1976

Original issue's description:
> Used native deinterleaved and float point format for the input streams.
>
> If we call GetProperty of kAudioUnitProperty_StreamFormat before setting the format, the device will report kAudioFormatFlagsNativeFloatPacked | kLinearPCMFormatFlagIsNonInterleaved as the native format of the device, which is the same as the output.
>
> This patch changes the format to use kAudioFormatFlagsNativeFloatPacked | kLinearPCMFormatFlagIsNonInterleaved to open the device, so that we will avoid format flipping back and forth. Hope this optimization will help increase the stability of the input audio on Mac.
>
>
> BUG=404884
> TEST=media_unittests && https://webrtc.googlecode.com/svn-history/r5497/trunk/samples/js/demos/html/pc1.html, https://www.google.com/intl/en/chrome/demos/speech.html
>
> Committed: https://chromium.googlesource.com/chromium/src/+/1a9ce977642c7f2cc2e30d83757c42264f052f0b

TBR=dalecurtis@chromium.org,eroman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404884

Review URL: https://codereview.chromium.org/514773002

Cr-Commit-Position: refs/heads/master@{#292176}