Disable ReloadCacheControlBrowserTest if PlzNavigate is enabled

content/browser/loader/reload_cache_control_browsertest.cc

Index: content/browser/loader/reload_cache_control_browsertest.cc
diff --git a/content/browser/loader/reload_cache_control_browsertest.cc b/content/browser/loader/reload_cache_control_browsertest.cc
index 05e848158567f7720e3014283f74f1a84da06fa3..411f7658915ad6dddc3e143badfcbea5e9374811 100644
--- a/content/browser/loader/reload_cache_control_browsertest.cc
+++ b/content/browser/loader/reload_cache_control_browsertest.cc
@@ -157,6 +157,12 @@ IN_PROC_BROWSER_TEST_F(ReloadCacheControlBrowserTest, NormalReload) {
 
 // Test if bypassing reload issues requests with proper cache control flags.
 IN_PROC_BROWSER_TEST_F(ReloadCacheControlBrowserTest, BypassingReload) {
+  // TODO(crbug.com/671545): This test gets to be unstable if browser-side
+  // navigation is enabled. This is because we can not ensure which of frame and
+  // image requests hits the network first.
+  if (IsBrowserSideNavigationEnabled())
+    return;
+
   GURL url(embedded_test_server()->GetURL(kReloadTestPath));
 
   EXPECT_TRUE(NavigateToURL(shell(), url));