Exclude chrome/common/extensions/api/ from build if enable_extensions==0

chrome/common/extensions/api/extension_api_stub.cc

Index: chrome/common/extensions/api/extension_api_stub.cc
diff --git a/chrome/common/extensions/api/extension_api_stub.cc b/chrome/common/extensions/api/extension_api_stub.cc
new file mode 100644
index 0000000000000000000000000000000000000000..759c33e01625675c88d807924395261f83f66301
--- /dev/null
+++ b/chrome/common/extensions/api/extension_api_stub.cc
@@ -0,0 +1,26 @@
+// Copyright (c) 2012 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.
+
+// Stub methods to be used when extensions are disabled
+// i.e. ENABLE_EXTENSIONS is not defined
+
+#include "chrome/common/extensions/api/extension_api.h"
+
+namespace extensions {
+
+// static
+ExtensionAPI* ExtensionAPI::GetSharedInstance() {
+  return NULL;
+}
+
+// static
+ExtensionAPI* ExtensionAPI::CreateWithDefaultConfiguration() {
+  return NULL;
+}
+
+bool ExtensionAPI::IsPrivileged(const std::string& full_name) {
+  return false;
+}
+
+}  // namespace extensions