message: test flake: fix header casing integration test
  Given that most other integration tests don't set a timeout for
  an upstream connection that is expected to succeed, remove the
  timeout.
  Risk Level: low, test-only
  Testing: 1000 repetitions
  Doc Changes: n/a
  Release Notes: n/a
  Fixes:
diff: -#include <chrono>
  -
  #include "envoy/config/bootstrap/v2/bootstrap.pb.h"
  #include "common/buffer/buffer_impl.h"
  @@ -51,8 +49,7 @@ TEST_P(HeaderCasingIntegrationTest, VerifyCasedHeaders) {
  tcp_client->write(request, false);
  Envoy::FakeRawConnectionPtr upstream_connection;
  - ASSERT_TRUE(
  - fake_upstreams_[0]->waitForRawConnection(upstream_connection, std::chrono::milliseconds(10)));
  + ASSERT_TRUE(fake_upstreams_[0]->waitForRawConnection(upstream_connection));
  // Verify that the upstream request has proper cased headers.
  std::string upstream_request;
  