[net] Removes leak from HostResolverImplTest.CanceledRequestsReleaseJobSlots.

TEST=./net_unittests --gtest_filter=HostResolverImplTest.CanceledRequestsReleaseJobSlots

Review URL: https://chromiumcodereview.appspot.com/9584035

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124791 0039d316-1c4b-4281-b951-d872f2087c98

net/base/host_resolver_impl_unittest.cc

@@ -11,6 +11,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
+#include "base/stl_util.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/synchronization/condition_variable.h"
@@ -920,6 +921,8 @@ TEST_F(HostResolverImplTest, CanceledRequestsReleaseJobSlots) {
     MessageLoop::current()->Run();
 
   MessageLoop::current()->AssertIdle();
+
+  STLDeleteElements(&requests);
 }
 
 // Helper class used by HostResolverImplTest.CancelWithinCallback.