Revert 194560 "[SPDY] Replace SpdyIOBuffer with new SpdyBuffer c..."

Revert 194560 "[SPDY] Replace SpdyIOBuffer with new SpdyBuffer c..."

> [SPDY] Replace SpdyIOBuffer with new SpdyBuffer class
> 
> Use SpdyBuffer for both SPDY reads and writes. A future
> CL will add hooks to SpdyBuffer so that we keep track of
> flow control windows properly.
> 
> Replace SpdyFrameProducer with SpdyBufferProducer.
> 
> Also introduce new SpdyReadQueue class for delegates
> of SpdyStream to use.
> 
> BUG=176592
> 
> Review URL: https://codereview.chromium.org/13990005

TBR=akalin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=194562

[akalin, 2013-04-17 10:16:37]

Committed patchset #1 manually as r194562.