Remove SpdyInlinedVector from platform.

Inline absl implementation for SpdyInlinedVector (no pun intended).

PiperOrigin-RevId: 366302072
Change-Id: Ib4a374f70f3c28785e980ebe30bcabaec0829936
diff --git a/spdy/core/http2_priority_write_scheduler.h b/spdy/core/http2_priority_write_scheduler.h
index edd6783..5820145 100644
--- a/spdy/core/http2_priority_write_scheduler.h
+++ b/spdy/core/http2_priority_write_scheduler.h
@@ -82,7 +82,7 @@
   friend class test::Http2PriorityWriteSchedulerPeer<StreamIdType>;
 
   struct StreamInfo;
-  typedef SpdyInlinedVector<StreamInfo*, 4> StreamInfoVector;
+  using StreamInfoVector = absl::InlinedVector<StreamInfo*, 4>;
 
   struct StreamInfo : public SpdyIntrusiveLink<StreamInfo> {
     // ID for this stream.