Re-enable QuicTransportBrowserTest.ReceiveStream

The recent fix to stop resetting the stream after close probably
deflaked this test. It is not flaking on the CQ.

Re-enable it.

BUG=1064434

Change-Id: Ibdce899968aa144a6acafc2481245c1b2173898f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442913Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813094}

content/browser/loader/quic_transport_browsertest.cc

@@ -276,8 +276,7 @@ IN_PROC_BROWSER_TEST_F(QuicTransportBrowserTest, CreateSendStream) {
   ASSERT_TRUE(WaitForTitle(ASCIIToUTF16("PASS"), {ASCIIToUTF16("FAIL")}));
 }
 
-// Flaky on many platforms (see crbug/1064434).
-IN_PROC_BROWSER_TEST_F(QuicTransportBrowserTest, DISABLED_ReceiveStream) {
+IN_PROC_BROWSER_TEST_F(QuicTransportBrowserTest, ReceiveStream) {
   ASSERT_TRUE(embedded_test_server()->Start());
   ASSERT_TRUE(
       NavigateToURL(shell(), embedded_test_server()->GetURL("/title2.html")));