Add "clear" to about://instant.

chrome/browser/instant/instant_controller.h

Index: chrome/browser/instant/instant_controller.h
diff --git a/chrome/browser/instant/instant_controller.h b/chrome/browser/instant/instant_controller.h
index 8cdd55dc751234b948bab51948f50319cf249b5c..e523153f45f467365004bb059ea28849d76777ff 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -174,6 +174,9 @@ class InstantController : public InstantPage::Delegate,
   // |debug_events_| doesn't get too large.
   void LogDebugEvent(const std::string& info) const;
 
+  // Resets list of debug events.
+  void ClearDebugEvents();
+
   // See comments for |debug_events_| below.
   const std::list<std::pair<int64, std::string> >& debug_events() {
     return debug_events_;