Disable some extensions_unittests on LSAN builds.

extensions/renderer/mojo/stash_client_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "base/macros.h"
 #include "extensions/browser/mojo/stash_backend.h"
 #include "extensions/common/mojo/stash.mojom.h"
 #include "extensions/renderer/api_test_base.h"
@@ skipping 19 matching lines @@
     env->service_provider()->AddService(base::Bind(
         &StashBackend::BindToRequest, base::Unretained(stash_backend_.get())));
   }
 
   scoped_ptr<StashBackend> stash_backend_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StashClientTest);
 };
 
+// https://crbug.com/599898
+#if defined(LEAK_SANITIZER)
+#define MAYBE_StashAndRestore DISABLED_StashAndRestore
+#else
+#define MAYBE_StashAndRestore StashAndRestore
+#endif
 // Test that stashing and restoring work correctly.
-TEST_F(StashClientTest, StashAndRestore) {
+TEST_F(StashClientTest, MAYBE_StashAndRestore) {
   ASSERT_NO_FATAL_FAILURE(RunTest("stash_client_unittest.js", "testStash"));
   scoped_ptr<ModuleSystemTestEnvironment> restore_test_env(CreateEnvironment());
   ApiTestEnvironment restore_environment(restore_test_env.get());
   PrepareEnvironment(&restore_environment);
   restore_environment.RunTest("stash_client_unittest.js", "testRetrieve");
 }
 
 }  // namespace extensions