Exempt component and policy-installed extensions from policy blacklist check.

chrome/browser/extensions/crx_installer.cc

 // Copyright (c) 2011 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/crx_installer.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 360 matching lines @@
   if (frontend_weak_->extension_prefs()
       ->IsExtensionBlacklisted(extension_->id())) {
     VLOG(1) << "This extension: " << extension_->id()
             << " is blacklisted. Install failed.";
     ReportFailureFromUIThread(
         l10n_util::GetStringUTF8(IDS_EXTENSION_CANT_INSTALL_BLACKLISTED));
     return;
   }
 
   if (!frontend_weak_->extension_prefs()->IsExtensionAllowedByPolicy(
-      extension_->id())) {
+          extension_->id(), install_source_)) {
     ReportFailureFromUIThread(
         l10n_util::GetStringUTF8(IDS_EXTENSION_CANT_INSTALL_POLICY_BLACKLIST));
     return;
   }
 
   GURL overlapping_url;
   const Extension* overlapping_extension =
       frontend_weak_->
       GetExtensionByOverlappingWebExtent(extension_->web_extent());
   if (overlapping_extension &&
@@ skipping 204 matching lines @@
   // Some users (such as the download shelf) need to know when a
   // CRXInstaller is done.  Listening for the EXTENSION_* events
   // is problematic because they don't know anything about the
   // extension before it is unpacked, so they can not filter based
   // on the extension.
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_CRX_INSTALLER_DONE,
       content::Source<CrxInstaller>(this),
       content::NotificationService::NoDetails());
 }