Bug 1313479 - Part 0-1: Add missing includes to unified gtests. r=froydnj

MozReview-Commit-ID: 4KVwMQJcAIS

xpcom/tests/gtest/TestPLDHash.cpp

@@ -5,6 +5,8 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "PLDHashTable.h"
+#include "nsCOMPtr.h"
+#include "nsServiceManagerUtils.h"
 #include "gtest/gtest.h"
 
 // This test mostly focuses on edge cases. But more coverage of normal