Merge pull request #8292 from y-zeng/fix_uninit

Fix maybe-uninitialized variable

src/core/ext/transport/cronet/transport/cronet_transport.c

@@ -781,7 +781,7 @@ static enum e_op_result execute_stream_op(grpc_exec_ctx *exec_ctx,
                                                 &cronet_callbacks);
     CRONET_LOG(GPR_DEBUG, "%p = cronet_bidirectional_stream_create()", s->cbs);
     char *url = NULL;
-    const char *method = NULL;
+    const char *method = "POST";
     s->header_array.headers = NULL;
     convert_metadata_to_cronet_headers(
         stream_op->send_initial_metadata->list.head, s->curr_ct.host, &url,