PPAPI: Get TrackedCallback ready for running on non-main threads.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index 3a357a8e5fc0b716417c5396fc92368ce26dcb16..0f083b3e304a1c7311ec03ef7b3b8bdbe37ba9c2 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -479,8 +479,8 @@ PluginInstance::~PluginInstance() {
        i != plugin_object_copy.end(); ++i)
     delete *i;
 
-  if (lock_mouse_callback_)
-    TrackedCallback::ClearAndAbort(&lock_mouse_callback_);
+  if (TrackedCallback::IsPending(lock_mouse_callback_))
+    lock_mouse_callback_->Abort();
 
   delegate_->InstanceDeleted(this);
   module_->InstanceDeleted(this);
@@ -1642,7 +1642,7 @@ void PluginInstance::UpdateFlashFullscreenState(bool flash_fullscreen) {
   if (flash_fullscreen == flash_fullscreen_) {
     // Manually clear callback when fullscreen fails with mouselock pending.
     if (!flash_fullscreen && is_mouselock_pending)
-      TrackedCallback::ClearAndRun(&lock_mouse_callback_, PP_ERROR_FAILED);
+      lock_mouse_callback_->Run(PP_ERROR_FAILED);
     return;
   }
 
@@ -1650,7 +1650,7 @@ void PluginInstance::UpdateFlashFullscreenState(bool flash_fullscreen) {
   flash_fullscreen_ = flash_fullscreen;
   if (is_mouselock_pending && !delegate()->IsMouseLocked(this)) {
     if (!delegate()->LockMouse(this))
-      TrackedCallback::ClearAndRun(&lock_mouse_callback_, PP_ERROR_FAILED);
+      lock_mouse_callback_->Run(PP_ERROR_FAILED);
   }
 
   if (PluginHasFocus() != old_plugin_focus)
@@ -1911,10 +1911,8 @@ bool PluginInstance::IsProcessingUserGesture() {
 }
 
 void PluginInstance::OnLockMouseACK(bool succeeded) {
-  if (TrackedCallback::IsPending(lock_mouse_callback_)) {
-    TrackedCallback::ClearAndRun(&lock_mouse_callback_,
-                                 succeeded ? PP_OK : PP_ERROR_FAILED);
-  }
+  if (TrackedCallback::IsPending(lock_mouse_callback_))
+    lock_mouse_callback_->Run(succeeded ? PP_OK : PP_ERROR_FAILED);
 }
 
 void PluginInstance::OnMouseLockLost() {