Call WillStartRequestForTesting in TestRenderFrameHost

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 40d34b4c02ae41148ecfdfff1ee5263abe7d9efe..889c4b9faa487a5c7d665e4f10b0730f3c0347c7 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -2948,7 +2948,8 @@ ChromeContentBrowserClient::CreateThrottlesForNavigation(
     // Add interstitial page while merge session process (cookie reconstruction
     // from OAuth2 refresh token in ChromeOS login) is still in progress while
     // we are attempting to load a google property.
-    if (!merge_session_throttling_utils::AreAllSessionMergedAlready() &&
+    if (merge_session_throttling_utils::ShouldAttachNavigationThrottle() &&
+        !merge_session_throttling_utils::AreAllSessionMergedAlready() &&
         handle->GetURL().SchemeIsHTTPOrHTTPS()) {
       throttles.push_back(MergeSessionNavigationThrottle::Create(handle));
     }