Revert of Revert of Remove the last piece of deprecated synchronous IO code.

content/common/media/media_param_traits.cc

Index: content/common/media/media_param_traits.cc
diff --git a/content/common/media/media_param_traits.cc b/content/common/media/media_param_traits.cc
index 345f838119b4268c8121e0249ea1e1173088d606..405e89de17eb6ddd0bffcd292b01b3bd850ceb6c 100644
--- a/content/common/media/media_param_traits.cc
+++ b/content/common/media/media_param_traits.cc
@@ -24,7 +24,6 @@
   m->WriteInt(p.bits_per_sample());
   m->WriteInt(p.frames_per_buffer());
   m->WriteInt(p.channels());
-  m->WriteInt(p.input_channels());
   m->WriteInt(p.effects());
 }
 
@@ -32,7 +31,7 @@
                                         PickleIterator* iter,
                                         AudioParameters* r) {
   int format, channel_layout, sample_rate, bits_per_sample,
-      frames_per_buffer, channels, input_channels, effects;
+      frames_per_buffer, channels, effects;
 
   if (!m->ReadInt(iter, &format) ||
       !m->ReadInt(iter, &channel_layout) ||
@@ -40,13 +39,12 @@
       !m->ReadInt(iter, &bits_per_sample) ||
       !m->ReadInt(iter, &frames_per_buffer) ||
       !m->ReadInt(iter, &channels) ||
-      !m->ReadInt(iter, &input_channels) ||
       !m->ReadInt(iter, &effects))
     return false;
+
   AudioParameters params(static_cast<AudioParameters::Format>(format),
          static_cast<ChannelLayout>(channel_layout), channels,
-         input_channels, sample_rate, bits_per_sample, frames_per_buffer,
-         effects);
+         sample_rate, bits_per_sample, frames_per_buffer, effects);
   *r = params;
   if (!r->IsValid())
     return false;