chromeos: Move audio, power, and UI files into subdirs.

This moves more files from chrome/browser/chromeos/ into
subdirectories.

BUG=chromium-os:22896
TEST=did chrome os builds both with and without aura
TBR=sky

Review URL: http://codereview.chromium.org/9125006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116746 0039d316-1c4b-4281-b951-d872f2087c98
void AudioHandler::SetVolumePercent(double volume_percent) {
  volume_percent = min(max(volume_percent, 0.0), 100.0);
  mixer_->SetVolumeDb(PercentToVolumeDb(volume_percent));
}

void AudioHandler::SetVolumePercent(double volume_percent) {
  volume_percent = min(max(volume_percent, 0.0), 100.0);
  mixer_->SetVolumeDb(PercentToVolumeDb(volume_percent));
}
