Never lock the Pepper proxy lock on the IO thread

ppapi/proxy/ppapi_proxy_test.cc

Index: ppapi/proxy/ppapi_proxy_test.cc
diff --git a/ppapi/proxy/ppapi_proxy_test.cc b/ppapi/proxy/ppapi_proxy_test.cc
index 14362d964afca40a9e03516f075fc274edbad5bd..fdd16043515d1bf506a78238cb84746146e22bb9 100644
--- a/ppapi/proxy/ppapi_proxy_test.cc
+++ b/ppapi/proxy/ppapi_proxy_test.cc
@@ -163,7 +163,7 @@ Dispatcher* PluginProxyTestHarness::GetDispatcher() {
 
 void PluginProxyTestHarness::SetUpHarness() {
   // These must be first since the dispatcher set-up uses them.
-  CreatePluginGlobals();
+  CreatePluginGlobals(nullptr /* ipc_task_runner */);
   // Some of the methods called during set-up check that the lock is held.
   ProxyAutoLock lock;
 
@@ -190,7 +190,8 @@ void PluginProxyTestHarness::SetUpHarnessWithChannel(
     base::WaitableEvent* shutdown_event,
     bool is_client) {
   // These must be first since the dispatcher set-up uses them.
-  CreatePluginGlobals();
+  scoped_refptr<base::TaskRunner> ipc_task_runner(ipc_message_loop);
+  CreatePluginGlobals(ipc_message_loop);
   // Some of the methods called during set-up check that the lock is held.
   ProxyAutoLock lock;
 
@@ -223,12 +224,14 @@ void PluginProxyTestHarness::TearDownHarness() {
   plugin_globals_.reset();
 }
 
-void PluginProxyTestHarness::CreatePluginGlobals() {
+void PluginProxyTestHarness::CreatePluginGlobals(
+    const scoped_refptr<base::TaskRunner>& ipc_task_runner) {
   if (globals_config_ == PER_THREAD_GLOBALS) {
-    plugin_globals_.reset(new PluginGlobals(PpapiGlobals::PerThreadForTest()));
+    plugin_globals_.reset(new PluginGlobals(PpapiGlobals::PerThreadForTest(),
+                                            ipc_task_runner));
     PpapiGlobals::SetPpapiGlobalsOnThreadForTest(GetGlobals());
   } else {
-    plugin_globals_.reset(new PluginGlobals());
+    plugin_globals_.reset(new PluginGlobals(ipc_task_runner));
   }
 }