Implement an observer for the component updater.

chrome/browser/component_updater/test/update_checker_unittest.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 "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 131 matching lines @@
   error_message_ = error_message;
   results_ = results;
   Quit();
 }
 
 CrxUpdateItem UpdateCheckerTest::BuildCrxUpdateItem() {
   CrxComponent crx_component;
   crx_component.name = "test_jebg";
   crx_component.pk_hash.assign(jebg_hash, jebg_hash + arraysize(jebg_hash));
   crx_component.installer = NULL;
-  crx_component.observer = NULL;
   crx_component.version = base::Version("0.9");
   crx_component.fingerprint = "fp1";
 
   CrxUpdateItem crx_update_item;
   crx_update_item.status = CrxUpdateItem::kNew;
   crx_update_item.id = "jebgalgnebhfojomionfpkfelancnnkf";
   crx_update_item.component = crx_component;
 
   return crx_update_item;
 }
@@ skipping 64 matching lines @@
   EXPECT_EQ(1, post_interceptor_->GetCount())
       << post_interceptor_->GetRequestsAsString();
 
   EXPECT_NE(0, error_);
   EXPECT_STREQ("network error", error_message_.c_str());
   EXPECT_EQ(0ul, results_.list.size());
 }
 
 }  // namespace component_updater