Update to Chromium //base at Chromium commit 82baa9afc6620c68cb2168f20bb65e77e3e57f0a.

sync_socket.h

Index: sync_socket.h
diff --git a/sync_socket.h b/sync_socket.h
index 36d6bc1f59b06f5c41af91eed69884270e466c92..201fb1c1553dea6c4aa265fe28860e912219566d 100644
--- a/sync_socket.h
+++ b/sync_socket.h
@@ -83,10 +83,8 @@ class BASE_EXPORT SyncSocket {
                                     TimeDelta timeout);
 
   // Returns the number of bytes available. If non-zero, Receive() will not
-  // not block when called. NOTE: Some implementations cannot reliably
-  // determine the number of bytes available so avoid using the returned
-  // size as a promise and simply test against zero.
-  size_t Peek();
+  // not block when called.
+  virtual size_t Peek();
 
   // Extracts the contained handle.  Used for transferring between
   // processes.