Delete activity upon window deletion

athena/extensions/extensions_delegate.cc

Index: athena/extensions/extensions_delegate.cc
diff --git a/athena/extensions/extensions_delegate.cc b/athena/extensions/extensions_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..97bd0dda01f2df0bdc674b8d6406aa2315fb46af
--- /dev/null
+++ b/athena/extensions/extensions_delegate.cc
@@ -0,0 +1,39 @@
+// Copyright 2014 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 "athena/extensions/public/extensions_delegate.h"
+
+#include "base/logging.h"
+
+namespace athena {
+namespace {
+
+ExtensionsDelegate* instance = NULL;
+
+}  // namespace
+
+ExtensionsDelegate::ExtensionsDelegate() {
+  DCHECK(!instance);
+  instance = this;
+}
+
+ExtensionsDelegate::~ExtensionsDelegate() {
+  DCHECK(instance);
+  instance = NULL;
+}
+
+// static
+ExtensionsDelegate* ExtensionsDelegate::Get(content::BrowserContext* context) {
+  DCHECK(instance);
+  DCHECK_EQ(context, instance->GetBrowserContext());
+  return instance;
+}
+
+// static
+void ExtensionsDelegate::Shutdown() {
+  DCHECK(instance);
+  delete instance;
+}
+
+}  // namespace athena