Allow shared modules to whitelist extensions that import them.

chrome/browser/extensions/shared_module_service.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 "chrome/browser/extensions/shared_module_service.h"
 
 #include <vector>
 
 #include "base/version.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 44 matching lines @@
                                    ExtensionRegistry::EVERYTHING);
     if (!imported_module) {
       if (extension->from_webstore()) {
         status = IMPORT_STATUS_UNSATISFIED;
         missing_modules->push_back(*iter);
       } else {
         return IMPORT_STATUS_UNRECOVERABLE;
       }
     } else if (!SharedModuleInfo::IsSharedModule(imported_module)) {
       return IMPORT_STATUS_UNRECOVERABLE;
+    } else if (!SharedModuleInfo::IsExportAllowedByWhitelist(imported_module,
+                                                             extension->id())) {
+      return IMPORT_STATUS_UNRECOVERABLE;
     } else if (version_required.IsValid() &&
                imported_module->version()->CompareTo(version_required) < 0) {
       if (imported_module->from_webstore()) {
         outdated_modules->push_back(*iter);
         status = IMPORT_STATUS_UNSATISFIED;
       } else {
         return IMPORT_STATUS_UNRECOVERABLE;
       }
     }
   }
@@ skipping 86 matching lines @@
 void SharedModuleService::OnExtensionUninstalled(const Extension* extension) {
   PruneSharedModulesOnUninstall(extension);
 }
 
 void SharedModuleService::OnShutdown() {
   InstallTracker::Get(context_)->RemoveObserver(this);
   observing_ = false;
 }
 
 }  // namespace extensions