Disable CrossProcessHistory and CrossProcessFragment with PlzNavigate.

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
index db83bc1924e5bfab847351e7aa26749f5816d50d..715627e552dd8d49536b957fb469e2faf142cad9 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_apitest.cc
@@ -728,8 +728,11 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcessAbort) {
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
-// crbug.com/708139.
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_CrossProcessFragment) {
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcessFragment) {
+  // This test is flaky with PlzNavigate (https://crbug.com/708139).
+  if (content::IsBrowserSideNavigationEnabled())
+    return;
+
   ASSERT_TRUE(StartEmbeddedTestServer());
 
   // See crossProcessFragment/f.html.
@@ -750,8 +753,11 @@ IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_CrossProcessFragment) {
       << message_;
 }
 
-// crbug.com/708139.
-IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, DISABLED_CrossProcessHistory) {
+IN_PROC_BROWSER_TEST_F(WebNavigationApiTest, CrossProcessHistory) {
+  // This test is flaky with PlzNavigate (https://crbug.com/708139).
+  if (content::IsBrowserSideNavigationEnabled())
+    return;
+
   ASSERT_TRUE(StartEmbeddedTestServer());
 
   // See crossProcessHistory/e.html.