Simplify CombineFrames() interface.

net/http/bidirectional_stream_unittest.cc

Index: net/http/bidirectional_stream_unittest.cc
diff --git a/net/http/bidirectional_stream_unittest.cc b/net/http/bidirectional_stream_unittest.cc
index 7a7407ed2bb8b80a8d683acfdd0e2a5248b478f1..07810b16070bb2323ec6005d3200c6f30f9c15e0 100644
--- a/net/http/bidirectional_stream_unittest.cc
+++ b/net/http/bidirectional_stream_unittest.cc
@@ -386,7 +386,7 @@ class MockTimer : public base::MockTimer {
 
 }  // namespace
 
-class BidirectionalStreamTest : public testing::TestWithParam<bool> {
+class BidirectionalStreamTest : public testing::Test {
  public:
   BidirectionalStreamTest()
       : default_url_(kDefaultUrl),