Attempt 2 to enable async data: URL loading.

content/renderer/browser_plugin/browser_plugin_browsertest.cc

Index: content/renderer/browser_plugin/browser_plugin_browsertest.cc
diff --git a/content/renderer/browser_plugin/browser_plugin_browsertest.cc b/content/renderer/browser_plugin/browser_plugin_browsertest.cc
index f2779940274528f92013523d4a4d2c58a2001d6a..d8a36788ab0c941234ef97b3d7668b5ee55ab09b 100644
--- a/content/renderer/browser_plugin/browser_plugin_browsertest.cc
+++ b/content/renderer/browser_plugin/browser_plugin_browsertest.cc
@@ -167,6 +167,10 @@ MockBrowserPlugin* BrowserPluginTest::GetCurrentPlugin() {
 
 MockBrowserPlugin* BrowserPluginTest::GetCurrentPluginWithAttachParams(
     BrowserPluginHostMsg_Attach_Params* params) {
+  // Make sure the BrowserPluginHostMsg_Attach IPC message is handled before
+  // proceeding any further.
+  ProcessPendingMessages();
+
   int instance_id = 0;
   const IPC::Message* msg =
       browser_plugin_manager()->sink().GetUniqueMessageMatching(