Skip parts of WebFrameTestClient::DidReceiveTitle if called too early.

Bug: 786692
Change-Id: I5e5d2aaef1b6e9abfc20a752df67a8eedb8a5c07
Reviewed-on: https://chromium-review.googlesource.com/791535Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519923}

content/shell/test_runner/web_frame_test_client.cc

@@ -452,7 +452,8 @@ void WebFrameTestClient::DidCommitProvisionalLoad(
 
 void WebFrameTestClient::DidReceiveTitle(const blink::WebString& title,
                                          blink::WebTextDirection direction) {
-  if (test_runner()->shouldDumpFrameLoadCallbacks()) {
+  if (test_runner()->shouldDumpFrameLoadCallbacks() &&
+      web_frame_test_proxy_base_->web_frame()) {
     PrintFrameDescription(delegate_, web_frame_test_proxy_base_->web_frame());
     delegate_->PrintMessage(std::string(" - didReceiveTitle: ") + title.Utf8() +
                             "\n");