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

content/public/test/browser_test_base.h

Index: content/public/test/browser_test_base.h
diff --git a/content/public/test/browser_test_base.h b/content/public/test/browser_test_base.h
index 30f7f0a93d5e489a033896652036f4c7f7debd01..0b266e25616356b6bf1f05ca58d2aa6a1c2e8c5d 100644
--- a/content/public/test/browser_test_base.h
+++ b/content/public/test/browser_test_base.h
@@ -114,7 +114,7 @@ class BrowserTestBase : public testing::Test {
   void CreateTestServer(const base::FilePath& test_server_base);
 
   // When the test is running in --single-process mode, runs the given task on
-  // the in-process renderer thread. A nested message loop is run until it
+  // the in-process renderer thread. A nested run loop is run until it
   // returns.
   void PostTaskToInProcessRendererAndWait(const base::Closure& task);