Change large header size in EndToEndTest.WayTooLongRequestHeaders.

Much smaller headers are enough to trigger the behavior this test is exercising.
Large headers are causing test timeouts under different scenarios:
  * TLS + HPACK (b/157248143)
  * QPACK only on tsan bots on Chromium (b/169262950)

PiperOrigin-RevId: 336935923
Change-Id: Idd76963a8e008b459111bd2245d02d446c097fe7

quic/core/http/end_to_end_test.cc

diff --git a/quic/core/http/end_to_end_test.cc b/quic/core/http/end_to_end_test.cc
index 6145a79..43d95a3 100644
--- a/quic/core/http/end_to_end_test.cc
+++ b/quic/core/http/end_to_end_test.cc
@@ -3920,21 +3920,17 @@
   EXPECT_FALSE(QuicStreamSequencerPeer::IsUnderlyingBufferAllocated(sequencer));
 }
 
+// A single large header value causes a different error than the total size of
+// headers exceeding a smaller limit, tested at EndToEndTest.LargeHeaders.
 TEST_P(EndToEndTest, WayTooLongRequestHeaders) {
   ASSERT_TRUE(Initialize());
-  if (version_.UsesTls() && !version_.UsesHttp3()) {
-    // In T050, it took relatively long time for HPACK to compress the header
-    // while server will detect blackhole on NST message.
-    // TODO(b/157248143): remove this when the HPACK compression issue is
-    // understood.
-    return;
-  }
+
   SpdyHeaderBlock headers;
   headers[":method"] = "GET";
   headers[":path"] = "/foo";
   headers[":scheme"] = "https";
   headers[":authority"] = server_hostname_;
-  headers["key"] = std::string(64 * 1024 * 1024, 'a');
+  headers["key"] = std::string(2 * 1024 * 1024, 'a');
 
   client_->SendMessage(headers, "");
   client_->WaitForResponse();