Convert more test helpers to base::RunLoop, fix page title checks.

content/test/content_browser_test_utils_internal.cc

Index: content/test/content_browser_test_utils_internal.cc
diff --git a/content/test/content_browser_test_utils_internal.cc b/content/test/content_browser_test_utils_internal.cc
index 392439525ba2bc8451d4dc5720447e0382d6d94b..4d9423057b83a7d01095fafc450eaf6042d02cb5 100644
--- a/content/test/content_browser_test_utils_internal.cc
+++ b/content/test/content_browser_test_utils_internal.cc
@@ -378,15 +378,13 @@ UrlCommitObserver::UrlCommitObserver(FrameTreeNode* frame_tree_node,
                                        ->delegate()
                                        ->GetAsWebContents()),
       frame_tree_node_id_(frame_tree_node->frame_tree_node_id()),
-      url_(url),
-      message_loop_runner_(
-          new MessageLoopRunner(MessageLoopRunner::QuitMode::IMMEDIATE)) {
+      url_(url) {
 }
 
 UrlCommitObserver::~UrlCommitObserver() {}
 
 void UrlCommitObserver::Wait() {
-  message_loop_runner_->Run();
+  run_loop_.Run();
 }
 
 void UrlCommitObserver::DidFinishNavigation(
@@ -395,7 +393,7 @@ void UrlCommitObserver::DidFinishNavigation(
       !navigation_handle->IsErrorPage() &&
       navigation_handle->GetURL() == url_ &&
       navigation_handle->GetFrameTreeNodeId() == frame_tree_node_id_) {
-    message_loop_runner_->Quit();
+    run_loop_.Quit();
   }
 }