Replace "nested message loop" with "nested run loop" in comments.

chrome/browser/chrome_navigation_browsertest.cc

Index: chrome/browser/chrome_navigation_browsertest.cc
diff --git a/chrome/browser/chrome_navigation_browsertest.cc b/chrome/browser/chrome_navigation_browsertest.cc
index 0a1f0bf53bf8c65a0c222b3b7da26568308fa5fa..c9251da145008c0f1fbb6ca403107a43974e4c29 100644
--- a/chrome/browser/chrome_navigation_browsertest.cc
+++ b/chrome/browser/chrome_navigation_browsertest.cc
@@ -65,7 +65,7 @@ class DidStartNavigationObserver : public content::WebContentsObserver {
         message_loop_runner_(new content::MessageLoopRunner) {}
   ~DidStartNavigationObserver() override {}
 
-  // Runs a nested message loop and blocks until the full load has
+  // Runs a nested run loop and blocks until the full load has
   // completed.
   void Wait() { message_loop_runner_->Run(); }