Disables LoadTimingBrowserTest.HTTPS as it's flaky on ChromeOS

Sample failure:
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/9457

TBR=dtrainor@chromium.org

Bug: 1128033
Change-Id: Ib7696c28e273f5762fe5718c429d8b1ec82e3444
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505793Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821792}

chrome/browser/net/load_timing_browsertest.cc

@@ -132,7 +132,13 @@ IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, HTTP) {
   EXPECT_EQ(navigation_deltas.ssl_start, -1);
 }
 
-IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, HTTPS) {
+// TODO(crbug.com/1128033): Flaky on ChromeOS.
+#if defined(OS_CHROMEOS)
+#define MAYBE_HTTPS DISABLED_HTTPS
+#else
+#define MAYBE_HTTPS HTTPS
+#endif
+IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, MAYBE_HTTPS) {
   net::EmbeddedTestServer https_server(net::EmbeddedTestServer::TYPE_HTTPS);
   https_server.AddDefaultHandlers();
   ASSERT_TRUE(https_server.Start());