Revert "Disable flaky MetricsWebContentsObserverBrowserTests"

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc b/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
index 5ef2054457abf6e6482d9993b74e4b99dc00be46..ddd6cb8957531a8b6c00a4f6c600fb4849e6b2ff 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc
@@ -35,8 +35,7 @@ IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, NoNavigation) {
   histogram_tester_.ExpectTotalCount(internal::kHistogramFirstLayout, 0);
 }
 
-IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
-                       DISABLED_NewPage) {
+IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest, NewPage) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),
@@ -52,7 +51,7 @@ IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
 }
 
 IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
-                       DISABLED_SamePageNavigation) {
+                       SamePageNavigation) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),
@@ -67,7 +66,7 @@ IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
 }
 
 IN_PROC_BROWSER_TEST_F(MetricsWebContentsObserverBrowserTest,
-                       DISABLED_SameUrlNavigation) {
+                       SameUrlNavigation) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),