Disable flaky MetricsWebContentsObserverBrowserTest

BUG=630076
TBR=bmcquade@chromium.org

Review-Url: https://codereview.chromium.org/2166203002
Cr-Commit-Position: refs/heads/master@{#406783}

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

@@ -47,8 +47,9 @@ IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, NewPage) {
       internal::kHistogramParseBlockedOnScriptLoad, 1);
 }
 
+// Flaky in win: crbug.com/630076
 IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
-                       SamePageNavigation) {
+                       DISABLED_SamePageNavigation) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),
@@ -63,8 +64,9 @@ IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
   histogram_tester_.ExpectTotalCount(internal::kHistogramFirstLayout, 1);
 }
 
+// Flaky in win: crbug.com/630076
 IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
-                       SameUrlNavigation) {
+                       DISABLED_SameUrlNavigation) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),