Don't try to reload blacklisted extensions.

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 2013 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 "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 577 matching lines @@
   installer->set_delete_source(file_ownership_passed);
   installer->set_install_cause(extension_misc::INSTALL_CAUSE_UPDATE);
   installer->InstallCrx(extension_path);
 
   if (out_crx_installer)
     *out_crx_installer = installer.get();
 
   return true;
 }
 
-void ExtensionService::ReloadExtension(const std::string extension_id) {
+void ExtensionService::ReloadExtension(const std::string& extension_id) {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // If the extension is already reloading, don't reload again.
   if (extension_prefs_->GetDisableReasons(extension_id) &
       Extension::DISABLE_RELOAD) {
     return;
   }
 
+  // Ignore attempts to reload a blacklisted extension. Sometimes this can
+  // happen in a convoluted reload sequence triggered by the termination of a
+  // blacklisted extension and a naive attempt to reload it. For an example see
+  // http://crbug.com/373842.
+  if (registry_->blacklisted_extensions().Contains(extension_id))
+    return;
+
   base::FilePath path;
   const Extension* current_extension = GetExtensionById(extension_id, false);
 
   // Disable the extension if it's loaded. It might not be loaded if it crashed.
   if (current_extension) {
     // If the extension has an inspector open for its background page, detach
     // the inspector and hang onto a cookie for it, so that we can reattach
     // later.
     // TODO(yoz): this is not incognito-safe!
     extensions::ProcessManager* manager = system_->process_manager();
@@ skipping 1820 matching lines @@
 }
 
 void ExtensionService::OnProfileDestructionStarted() {
   ExtensionIdSet ids_to_unload = registry_->enabled_extensions().GetIDs();
   for (ExtensionIdSet::iterator it = ids_to_unload.begin();
        it != ids_to_unload.end();
        ++it) {
     UnloadExtension(*it, UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN);
   }
 }