Allow chrome.management.setEnabled() to re-enable crashed extensions.

chrome/browser/extensions/extension_service.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 "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 879 matching lines @@
 
   extension_prefs_->SetExtensionState(extension_id, Extension::DISABLED);
   extension_prefs_->AddDisableReason(extension_id, disable_reason);
 
   int include_mask = INCLUDE_ENABLED;
   include_mask |= INCLUDE_TERMINATED;
   extension = GetExtensionByIdInternal(extension_id, include_mask);
   if (!extension)
     return;
 
-  // Move it over to the disabled list.
+  // Move it over to the disabled list. Don't send a second unload notification
+  // for terminated extensions being disabled.
   disabled_extensions_.Insert(make_scoped_refptr(extension));
-  if (extensions_.Contains(extension->id()))
+  if (extensions_.Contains(extension->id())) {
     extensions_.Remove(extension->id());
-  else
+    NotifyExtensionUnloaded(extension, extension_misc::UNLOAD_REASON_DISABLE);
+  } else {
     terminated_extensions_.Remove(extension->id());
-
-  NotifyExtensionUnloaded(extension, extension_misc::UNLOAD_REASON_DISABLE);
+  }
 
   SyncExtensionChangeIfNeeded(*extension);
 
   // Deactivating one extension might have solved the problems of others.
   // Therefore, we clear warnings of this type for all extensions.
   std::set<ExtensionWarningSet::WarningType> warnings;
   extension_warnings_.GetWarningsAffectingExtension(extension_id, &warnings);
   extension_warnings_.ClearWarnings(warnings);
 }
 
@@ skipping 1706 matching lines @@
     extensions::ExtensionHost* extension_host) {
   if (!extension_host)
     return;
 
 #if !defined(OS_ANDROID)
   extensions::LaunchPlatformApp(extension_host->profile(),
                                 extension_host->extension(),
                                 NULL, FilePath());
 #endif
 }