Use WriteMemSlices() instead of WriteOrBufferData() in QuicTransportStream.
Originally, this was supposed to fix the fact that WriteOrBufferData() has unlimited buffering. However, as I wrote a test for that, I discovered that I've already added a check for this by accident when I originally wrote this code. I'm still switching this code to use WriteMemSlices() as it actually returns whether it has succeeded.
gfe-relnote: n/a (not used in production)
PiperOrigin-RevId: 288496889
Change-Id: I801c2f870dd04b9fa478e12452834ec38e20a870
2 files changed
