Implements an UpdateClient::SendUninstallPing API for the

extensions/browser/updater/update_service_unittest.cc

Index: extensions/browser/updater/update_service_unittest.cc
diff --git a/extensions/browser/updater/update_service_unittest.cc b/extensions/browser/updater/update_service_unittest.cc
index 283ff20fd26639e6c68f6ec4504c7cf5c6db296f..a6ed8b7f844915040e0e4a0061c2c266207d8d78 100644
--- a/extensions/browser/updater/update_service_unittest.cc
+++ b/extensions/browser/updater/update_service_unittest.cc
@@ -49,6 +49,9 @@ class FakeUpdateClient : public update_client::UpdateClient {
   }
   bool IsUpdating(const std::string& id) const override { return false; }
   void Stop() override {}
+  void SendUninstallPing(const std::string& id,
+                         const Version& version,
+                         int reason) override {}
 
  protected:
   friend class base::RefCounted<FakeUpdateClient>;