Ignore JavaScript messages (alert/confirm/prompt) during unload handlers.

chrome/browser/tab_contents/web_contents_unittest.cc

Index: chrome/browser/tab_contents/web_contents_unittest.cc
diff --git a/chrome/browser/tab_contents/web_contents_unittest.cc b/chrome/browser/tab_contents/web_contents_unittest.cc
index 0bc146347e79dbafd0116de6b2462ee2b51e340b..eef704f6a902a7ddc5d716038f7c05623d33b8fb 100644
--- a/chrome/browser/tab_contents/web_contents_unittest.cc
+++ b/chrome/browser/tab_contents/web_contents_unittest.cc
@@ -1524,9 +1524,10 @@ TEST_F(TabContentsTest, NoJSMessageOnInterstitials) {
   // attempting to show a JS message.
   IPC::Message* dummy_message = new IPC::Message;
   bool did_suppress_message = false;
+  const bool unload_handler_being_run = false;
   contents()->RunJavaScriptMessage(L"This is an informative message", L"OK",
-      kGURL, ui::MessageBoxFlags::kIsJavascriptAlert, dummy_message,
-      &did_suppress_message);
+      kGURL, ui::MessageBoxFlags::kIsJavascriptAlert, unload_handler_being_run,
+      dummy_message, &did_suppress_message);
   EXPECT_TRUE(did_suppress_message);
 }