Create a NavigationEntry for the initial blank page.

chrome/browser/password_manager/chrome_password_manager_client.cc

Index: chrome/browser/password_manager/chrome_password_manager_client.cc
diff --git a/chrome/browser/password_manager/chrome_password_manager_client.cc b/chrome/browser/password_manager/chrome_password_manager_client.cc
index 49da307f654d33c083b664ce73dbb383b97fc86f..725c3fd6dafe6d9be0dd844a386550738a0fe00d 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client.cc
+++ b/chrome/browser/password_manager/chrome_password_manager_client.cc
@@ -574,12 +574,9 @@ const GURL& ChromePasswordManagerClient::GetMainFrameURL() const {
 
 const GURL& ChromePasswordManagerClient::GetLastCommittedEntryURL() const {
   DCHECK(web_contents());
-  content::NavigationEntry* entry =
-      web_contents()->GetController().GetLastCommittedEntry();
-  if (!entry)
-    return GURL::EmptyGURL();
-
-  return entry->GetURL();
+  // TODO(creis): Clean up rest of uses from
+  // https://codereview.chromium.org/1260263002.
+  return web_contents()->GetController().GetLastCommittedEntry()->GetURL();
 }
 
 const password_manager::CredentialsFilter*