deprecate -FLAGS_quic_reloadable_flag_quic_disable_version_34 and remove support for QUIC v34.

net/quic/core/quic_headers_stream_test.cc

Index: net/quic/core/quic_headers_stream_test.cc
diff --git a/net/quic/core/quic_headers_stream_test.cc b/net/quic/core/quic_headers_stream_test.cc
index 056f34b266e597d6a8eb5e42ba35a89eb77d9974..f1f4816cdf8b968558be003d37c510fadcc2c207 100644
--- a/net/quic/core/quic_headers_stream_test.cc
+++ b/net/quic/core/quic_headers_stream_test.cc
@@ -539,9 +539,8 @@ TEST_P(QuicHeadersStreamTest, ProcessPushPromiseDisabledSetting) {
                         "Unsupported field of HTTP/2 SETTINGS frame: 2", _));
   }
   headers_stream_->OnStreamFrame(stream_frame_);
-  EXPECT_EQ(
-      session_.server_push_enabled(),
-      (perspective() == Perspective::IS_CLIENT && version() > QUIC_VERSION_34));
+  EXPECT_EQ(session_.server_push_enabled(),
+            perspective() == Perspective::IS_CLIENT);
 }
 
 TEST_P(QuicHeadersStreamTest, EmptyHeaderHOLBlockedTime) {