Flakiness cleanup: disable flaky tests under chrome/test/

chrome/test/perf/feature_startup_test.cc

Index: chrome/test/perf/feature_startup_test.cc
diff --git a/chrome/test/perf/feature_startup_test.cc b/chrome/test/perf/feature_startup_test.cc
index dddc776d57dbe8fdc8f6d768d1d8f344c5be0607..612f157f822b052bd40bc3eb4217bbfbb1b67f11 100644
--- a/chrome/test/perf/feature_startup_test.cc
+++ b/chrome/test/perf/feature_startup_test.cc
@@ -159,40 +159,40 @@ class NewTabUIStartupTest : public UIPerfTest {
 };
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_PerfRefCold) {
+TEST_F(NewTabUIStartupTest, DISABLED_PerfRefCold) {
   UseReferenceBuild();
   RunStartupTest("tab_cold_ref", false /* cold */, true /* important */,
                  UITestBase::DEFAULT_THEME);
 }
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_PerfCold) {
+TEST_F(NewTabUIStartupTest, DISABLED_PerfCold) {
   RunStartupTest("tab_cold", false /* cold */, true /* important */,
                  UITestBase::DEFAULT_THEME);
 }
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_PerfRefWarm) {
+TEST_F(NewTabUIStartupTest, DISABLED_PerfRefWarm) {
   UseReferenceBuild();
   RunStartupTest("tab_warm_ref", true /* warm */, true /* not important */,
                  UITestBase::DEFAULT_THEME);
 }
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_PerfWarm) {
+TEST_F(NewTabUIStartupTest, DISABLED_PerfWarm) {
   RunStartupTest("tab_warm", true /* warm */, true /* not important */,
                  UITestBase::DEFAULT_THEME);
 }
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_ComplexThemeCold) {
+TEST_F(NewTabUIStartupTest, DISABLED_ComplexThemeCold) {
   RunStartupTest("tab_complex_theme_cold", false /* cold */,
                  false /* not important */,
                  UITestBase::COMPLEX_THEME);
 }
 
 // FLAKY: http://crbug.com/69940
-TEST_F(NewTabUIStartupTest, FLAKY_NewTabTimingTestsCold) {
+TEST_F(NewTabUIStartupTest, DISABLED_NewTabTimingTestsCold) {
   RunNewTabTimingTest();
 }