Add extensions code to use common updater in components/update_client/

chrome/browser/extensions/extension_system_impl.cc

Index: chrome/browser/extensions/extension_system_impl.cc
diff --git a/chrome/browser/extensions/extension_system_impl.cc b/chrome/browser/extensions/extension_system_impl.cc
index bbf145271eb450debc87dffe976a98c1ff78c2f0..836c82953a6517892637290520748b0a994f0269 100644
--- a/chrome/browser/extensions/extension_system_impl.cc
+++ b/chrome/browser/extensions/extension_system_impl.cc
@@ -8,6 +8,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/trace_event/trace_event.h"
@@ -374,6 +375,12 @@ scoped_ptr<ExtensionSet> ExtensionSystemImpl::GetDependentExtensions(
       extension);
 }
 
+void ExtensionSystemImpl::InstallUpdate(const std::string& extension_id,
+                                        const base::FilePath& temp_dir) {
+  NOTREACHED() << "Not yet implemented";
+  base::DeleteFile(temp_dir, true /* recursive */);
+}
+
 void ExtensionSystemImpl::RegisterExtensionWithRequestContexts(
     const Extension* extension,
     const base::Closure& callback) {