PPAPI: Remove threading options; it's always on

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 00947e39a1bade62618c1405ca2d2c7594447d6e..9034d8fa75cd636069be3703b91e86858af72425 100644
--- a/ppapi/proxy/ppapi_proxy_test.cc
+++ b/ppapi/proxy/ppapi_proxy_test.cc
@@ -171,6 +171,8 @@ Dispatcher* PluginProxyTestHarness::GetDispatcher() {
 void PluginProxyTestHarness::SetUpHarness() {
   // These must be first since the dispatcher set-up uses them.
   CreatePluginGlobals();
+  // Some of the methods called during set-up check that the lock is held.
+  ProxyAutoLock lock;
 
   resource_tracker().DidCreateInstance(pp_instance());
 
@@ -196,6 +198,8 @@ void PluginProxyTestHarness::SetUpHarnessWithChannel(
     bool is_client) {
   // These must be first since the dispatcher set-up uses them.
   CreatePluginGlobals();
+  // Some of the methods called during set-up check that the lock is held.
+  ProxyAutoLock lock;
 
   resource_tracker().DidCreateInstance(pp_instance());
   plugin_delegate_mock_.Init(ipc_message_loop, shutdown_event);
@@ -214,10 +218,15 @@ void PluginProxyTestHarness::SetUpHarnessWithChannel(
 }
 
 void PluginProxyTestHarness::TearDownHarness() {
-  plugin_dispatcher_->DidDestroyInstance(pp_instance());
-  plugin_dispatcher_.reset();
+  {
+    // Some of the methods called during tear-down check that the lock is held.
+    ProxyAutoLock lock;
+
+    plugin_dispatcher_->DidDestroyInstance(pp_instance());
+    plugin_dispatcher_.reset();
 
-  resource_tracker().DidDeleteInstance(pp_instance());
+    resource_tracker().DidDeleteInstance(pp_instance());
+  }
   plugin_globals_.reset();
 }