Attempt to fix a renderer crash in NetErrorHelperCore.

chrome/renderer/net/net_error_helper.cc

Index: chrome/renderer/net/net_error_helper.cc
diff --git a/chrome/renderer/net/net_error_helper.cc b/chrome/renderer/net/net_error_helper.cc
index d739cdcbc44664e7e8da4885f899c7aa579661f5..e15afb0067c0fab5b206af44e7ad80e5868ae189 100644
--- a/chrome/renderer/net/net_error_helper.cc
+++ b/chrome/renderer/net/net_error_helper.cc
@@ -112,6 +112,11 @@ void NetErrorHelper::DidStartProvisionalLoad() {
 
 void NetErrorHelper::DidCommitProvisionalLoad(bool is_new_navigation,
                                               bool is_same_page_navigation) {
+  // If this is a "same page" navigation, it's not a real navigation.  There
+  // wasn't a start event for it, either, so just ignore it.
+  if (is_same_page_navigation)
+    return;
+
   // Invalidate weak pointers from old error page controllers. If loading a new
   // error page, the controller has not yet been attached, so this won't affect
   // it.