Fix some unit_tests under PlzNavigate

content/public/test/test_renderer_host.cc

Index: content/public/test/test_renderer_host.cc
diff --git a/content/public/test/test_renderer_host.cc b/content/public/test/test_renderer_host.cc
index d385871bbf9ea30a84975834abc2050cec70f82a..8765eef5cc25f117f53e8df564e92452e7402873 100644
--- a/content/public/test/test_renderer_host.cc
+++ b/content/public/test/test_renderer_host.cc
@@ -16,9 +16,9 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/browser_side_navigation_policy.h"
+#include "content/public/test/browser_side_navigation_test_utils.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/test_browser_context.h"
-#include "content/test/browser_side_navigation_test_utils.h"
 #include "content/test/content_browser_sanity_checker.h"
 #include "content/test/test_render_frame_host.h"
 #include "content/test/test_render_frame_host_factory.h"
@@ -60,6 +60,10 @@ RenderFrameHost* RenderFrameHostTester::GetPendingForController(
     NavigationController* controller) {
   WebContentsImpl* web_contents = static_cast<WebContentsImpl*>(
       controller->GetWebContents());
+  if (IsBrowserSideNavigationEnabled()) {
+    return web_contents->GetRenderManagerForTesting()
+        ->speculative_render_frame_host_.get();
+  }
   return web_contents->GetRenderManagerForTesting()->pending_frame_host();
 }