Merge revision 1543 changes:

- Fix crash when browser window creation is canceled (issue #1147).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1547@1545 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_host_impl.cc

@@ -311,7 +311,7 @@ CefRefPtr<CefBrowser> CefBrowserHost::CreateBrowserSync(
   CefRefPtr<CefBrowserHostImpl> browser =
       CefBrowserHostImpl::Create(windowInfo, new_settings, client, NULL, info,
                                  NULL);
-  if (!url.empty()) {
+  if (browser && !url.empty()) {
     browser->LoadURL(CefFrameHostImpl::kMainFrameId, url, content::Referrer(),
                      content::PAGE_TRANSITION_TYPED, std::string());
   }