PlzNavigate: disable RenderFrameHostManagerTest::PageDoesBackAndReload.

content/browser/frame_host/render_frame_host_manager_unittest.cc

Index: content/browser/frame_host/render_frame_host_manager_unittest.cc
diff --git a/content/browser/frame_host/render_frame_host_manager_unittest.cc b/content/browser/frame_host/render_frame_host_manager_unittest.cc
index 5c093da4839e1352cde8f043cf96c6591a6e675e..87f129128f76690fb82046c53b31206b77fcac13 100644
--- a/content/browser/frame_host/render_frame_host_manager_unittest.cc
+++ b/content/browser/frame_host/render_frame_host_manager_unittest.cc
@@ -1216,6 +1216,21 @@ TEST_F(RenderFrameHostManagerTest, WebUIWasCleared) {
 // Also tests that only user-gesture navigations can interrupt cross-process
 // navigations. http://crbug.com/75195
 TEST_F(RenderFrameHostManagerTest, PageDoesBackAndReload) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableBrowserSideNavigation)) {
+    // PlzNavigate uses a significantly different logic for renderer initiated
+    // navigations and navigation cancellation. Adapting this test would make it
+    // full of special cases and almost unreadable.
+    // There are tests that exercise these concerns for PlzNavigate, all from
+    // NavigatorTestWithBrowserSideNavigation:
+    // - BrowserInitiatedNavigationCancel
+    // - RendererUserInitiatedNavigationCancel
+    // - RendererNonUserInitiatedNavigationDoesntCancelRendererUserInitiated
+    // - RendererNonUserInitiatedNavigationDoesntCancelBrowserInitiated
+    // - RendererNonUserInitiatedNavigationCancelSimilarNavigation
+    SUCCEED() << "Test is not applicable with browser side navigation enabled";
+    return;
+  }
   const GURL kUrl1("http://www.google.com/");
   const GURL kUrl2("http://www.evil-site.com/");