Don't send unnecessary ExtensionMsg_Loaded IPCs.

chrome/browser/extensions/extension_startup_browsertest.cc

 // 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.
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
@@ skipping 238 matching lines @@
     one_extension_path = one_extension_path
         .AppendASCII("extensions")
         .AppendASCII("good")
         .AppendASCII("Extensions")
         .AppendASCII("behllobkkfkfnphdnhnkndlbkcpglgmj")
         .AppendASCII("1.0.0.0");
     load_extensions_.push_back(one_extension_path.value());
   }
 };
 
-// Fails inconsistently on Linux x64. http://crbug.com/80961
-// TODO(dpapad): Has not failed since October 2011, let's reenable, monitor
-// and act accordingly.
 IN_PROC_BROWSER_TEST_F(ExtensionsLoadTest, Test) {
   WaitForServicesToStart(1, true);
   TestInjection(true, true);
 }
 
 // ExtensionsLoadMultipleTest
 // Ensures that we can startup the browser with multiple extensions
 // via --load-extension=X1,X2,X3.
 class ExtensionsLoadMultipleTest : public ExtensionStartupTestBase {
  public:
@@ skipping 28 matching lines @@
         .AppendASCII("extensions")
         .AppendASCII("app2");
     load_extensions_.push_back(fourth_extension_path.value());
   }
 };
 
 IN_PROC_BROWSER_TEST_F(ExtensionsLoadMultipleTest, Test) {
   WaitForServicesToStart(4, true);
   TestInjection(true, true);
 }