[DevTools] Fix crash in Page.reload when there is no visible entry.

content/browser/devtools/protocol/page_handler.cc

Index: content/browser/devtools/protocol/page_handler.cc
diff --git a/content/browser/devtools/protocol/page_handler.cc b/content/browser/devtools/protocol/page_handler.cc
index c1e88169d5d9d4dbf8734971433842f5c782986c..73c4c8ea965128b9d683c3b6473413d42916cd8f 100644
--- a/content/browser/devtools/protocol/page_handler.cc
+++ b/content/browser/devtools/protocol/page_handler.cc
@@ -214,7 +214,8 @@ Response PageHandler::Reload(const bool* ignoreCache,
     return Response::InternalError("Could not connect to view");
 
   if (web_contents->IsCrashed() ||
-      web_contents->GetController().GetVisibleEntry()->IsViewSourceMode()) {
+      (web_contents->GetController().GetVisibleEntry() &&
+       web_contents->GetController().GetVisibleEntry()->IsViewSourceMode())) {
     web_contents->GetController().Reload(false);
     return Response::OK();
   } else {