Fix event warning crash when a listener is removed while dispatching event

components/test_runner/test_runner.h

Index: components/test_runner/test_runner.h
diff --git a/components/test_runner/test_runner.h b/components/test_runner/test_runner.h
index 504aa4223e8b5661ba0e676ea190a691a8d13c6c..77c31364c8db3ddb3be64f6d8a32371c98ee7890 100644
--- a/components/test_runner/test_runner.h
+++ b/components/test_runner/test_runner.h
@@ -161,6 +161,8 @@ class TestRunner : public WebTestRunner {
   void DidOpenChooser();
   void DidCloseChooser();
 
+  bool ShouldDumpConsoleMessages() const;
+
   // A single item in the work queue.
   class WorkItem {
    public:
@@ -450,6 +452,10 @@ class TestRunner : public WebTestRunner {
   // policy passed to the decidePolicyForNavigation callback.
   void DumpNavigationPolicy();
 
+  // Controls whether console messages produced by the page are dumped
+  // to test output.
+  void SetDumpConsoleMessages(bool value);
+
   ///////////////////////////////////////////////////////////////////////////
   // Methods interacting with the WebTestProxy