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

ppapi/proxy/plugin_globals.cc

Index: ppapi/proxy/plugin_globals.cc
diff --git a/ppapi/proxy/plugin_globals.cc b/ppapi/proxy/plugin_globals.cc
index 3083832b341a354a75ef750db0ed9847abc81c27..fba5b1fe762e5ca4957a2db51058d7d6941f2fe7 100644
--- a/ppapi/proxy/plugin_globals.cc
+++ b/ppapi/proxy/plugin_globals.cc
@@ -76,7 +76,7 @@ PluginGlobals::~PluginGlobals() {
     // count, so this will delete the MessageLoop resource. We do this before
     // we clear plugin_globals_, because the Resource destructor tries to access
     // this PluginGlobals.
-    DCHECK(!loop_for_main_thread_ || loop_for_main_thread_->HasOneRef());
+    DCHECK(!loop_for_main_thread_.get() || loop_for_main_thread_->HasOneRef());
     loop_for_main_thread_ = NULL;
   }
   plugin_globals_ = NULL;