Bug 1142841: Convert all nsRefPtr<nsIRunnable> to nsCOMPtr<nsIRunnable>. r=ehsan

This patch was generated by a script.  Here's the source of the script for
future reference:

find . \( -iname "*.cpp" -o -iname "*.h" \) | \
  xargs -n 1 sed -i "s/nsRefPtr<nsIRunnable>/nsCOMPtr<nsIRunnable>/g"

xpcom/base/CycleCollectedJSRuntime.cpp

@@ -937,7 +937,7 @@ CycleCollectedJSRuntime::SetPendingException(nsIException* aException)
   mPendingException = aException;
 }
 
-nsTArray<nsRefPtr<nsIRunnable>>&
+nsTArray<nsCOMPtr<nsIRunnable>>&
 CycleCollectedJSRuntime::GetPromiseMicroTaskQueue()
 {
   return mPromiseMicroTaskQueue;