Refactor the UpdateEngine and its actions in the component updater.

components/update_client/request_sender_unittest.cc

Index: components/update_client/request_sender_unittest.cc
diff --git a/components/update_client/request_sender_unittest.cc b/components/update_client/request_sender_unittest.cc
index e0b891461fd90eb6507cf39ac9aa6cee5ed0c580..056fae26d78198138e078e1d9e8c3e7c3419d110 100644
--- a/components/update_client/request_sender_unittest.cc
+++ b/components/update_client/request_sender_unittest.cc
@@ -162,6 +162,11 @@ TEST_F(RequestSenderTest, RequestSendSuccess) {
   EXPECT_EQ(1, post_interceptor_1_->GetCount())
       << post_interceptor_1_->GetRequestsAsString();
 
+  EXPECT_EQ(0, post_interceptor_2_->GetHitCount())
+      << post_interceptor_2_->GetRequestsAsString();
+  EXPECT_EQ(0, post_interceptor_2_->GetCount())
+      << post_interceptor_2_->GetRequestsAsString();
+
   // Sanity check the request.
   EXPECT_STREQ("test", post_interceptor_1_->GetRequests()[0].c_str());