Bug 1269648 - Add missing crash-reporter null checks. r=froydnj.

In two places we fail to check if we successful obtained the crash reporter
before we use it.

--HG--
extra : rebase_source : f757b8320788220b5a4d5242a0264d577d92f15e

xpcom/tests/gtest/TestPLDHash.cpp

@@ -50,7 +50,9 @@ TestCrashyOperation(void (*aCrashyOperation)())
 #ifdef MOZ_CRASHREPORTER
     nsCOMPtr<nsICrashReporter> crashreporter =
       do_GetService("@mozilla.org/toolkit/crash-reporter;1");
-    crashreporter->SetEnabled(false);
+    if (crashreporter) {
+      crashreporter->SetEnabled(false);
+    }
 #endif
 
     // Child: perform the crashy operation.

xpcom/threads/nsThread.cpp

@@ -463,7 +463,9 @@ static bool SaveMemoryReportNearOOM()
   if (needMemoryReport) {
     nsCOMPtr<nsICrashReporter> cr =
       do_GetService("@mozilla.org/toolkit/crash-reporter;1");
-    cr->SaveMemoryReport();
+    if (cr) {
+      cr->SaveMemoryReport();
+    }
   }
 
   return needMemoryReport;