Update ppapi/ to use scoped_refptr<T>::get() rather than implicit "operator T*"

ppapi/host/resource_message_filter.cc

Index: ppapi/host/resource_message_filter.cc
diff --git a/ppapi/host/resource_message_filter.cc b/ppapi/host/resource_message_filter.cc
index ac9d32420ce56b862a04c9f277e6214c488816a1..9442ce033ba4c3c67a6a708b8c231b57e7ac5cf5 100644
--- a/ppapi/host/resource_message_filter.cc
+++ b/ppapi/host/resource_message_filter.cc
@@ -40,7 +40,7 @@ void ResourceMessageFilter::OnFilterDestroyed() {
 bool ResourceMessageFilter::HandleMessage(const IPC::Message& msg,
                                           HostMessageContext* context) {
   scoped_refptr<base::TaskRunner> runner = OverrideTaskRunnerForMessage(msg);
-  if (runner) {
+  if (runner.get()) {
     // TODO(raymes): We need to make a copy so the context can be used on other
     // threads. It would be better to have a thread-safe refcounted context.
     HostMessageContext context_copy = *context;