Disables LoadTimingBrowserTest.HTTPS as it's flaky on chromeos too

BUG=1128033
TEST=test only change
TBR=ryansturm@chromium.org

Change-Id: I271de37305ee5714f2a46e29f71b4ebbd5d9fb50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495641
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Auto-Submit: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820400}

chrome/browser/net/load_timing_browsertest.cc

@@ -131,13 +131,8 @@ IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, HTTP) {
   EXPECT_EQ(navigation_deltas.ssl_start, -1);
 }
 
-// TODO(crbug.com/1128033): Flaky on Windows and Linux.
-#if defined(OS_WIN) || defined(OS_LINUX)
-#define MAYBE_HTTPS DISABLED_HTTPS
-#else
-#define MAYBE_HTTPS HTTPS
-#endif
-IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, MAYBE_HTTPS) {
+// TODO(crbug.com/1128033): flaky.
+IN_PROC_BROWSER_TEST_F(LoadTimingBrowserTest, DISABLED_HTTPS) {
   net::EmbeddedTestServer https_server(net::EmbeddedTestServer::TYPE_HTTPS);
   https_server.AddDefaultHandlers();
   ASSERT_TRUE(https_server.Start());