Provide a NSAutoreleasePool for the SequencedWorkerPool::Inner::ThreadLoop().

base/threading/sequenced_worker_pool.cc

Index: base/threading/sequenced_worker_pool.cc
diff --git a/base/threading/sequenced_worker_pool.cc b/base/threading/sequenced_worker_pool.cc
index d994d977d308c6e57ea55a60520204ef4b022852..be8f4639853b710b7e7f688260a37b7c6af4411a 100644
--- a/base/threading/sequenced_worker_pool.cc
+++ b/base/threading/sequenced_worker_pool.cc
@@ -26,6 +26,10 @@
 #include "base/time.h"
 #include "base/tracked_objects.h"
 
+#if defined(OS_MACOSX)
+#include "base/mac/scoped_nsautorelease_pool.h"
+#endif
+
 namespace base {
 
 namespace {
@@ -409,6 +413,10 @@ void SequencedWorkerPool::Inner::ThreadLoop(Worker* this_worker) {
     DCHECK(result.second);
 
     while (true) {
+#if defined(OS_MACOSX)
+      base::mac::ScopedNSAutoreleasePool autorelease_pool;
+#endif
+
       // See GetWork for what delete_these_outside_lock is doing.
       SequencedTask task;
       std::vector<Closure> delete_these_outside_lock;