Fix several leaks in the Sky compositor

mojo/gpu/gl_context_owner.cc

+// 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 "mojo/gpu/gl_context_owner.h"
+
+#include "mojo/gpu/gl_context.h"
+
+namespace mojo {
+
+GLContextOwner::GLContextOwner(mojo::Shell* shell)
+    : context_(mojo::GLContext::Create(shell)) {
+}
+
+GLContextOwner::~GLContextOwner() {
+  context_->Destroy();
+}
+
+}  // namespace mojo