Catch the sign zip error earlier to prevent invalid private key crash Chrome.

chrome/browser/extensions/extension_service_unittest.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_unittest.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 2184 matching lines @@
                             base::FilePath(), ExtensionCreator::kOverwriteCRX));
 
   // Try packing with an invalid manifest.
   std::string invalid_manifest_content = "I am not a manifest.";
   ASSERT_TRUE(file_util::WriteFile(
       temp_dir2.path().Append(extensions::kManifestFilename),
       invalid_manifest_content.c_str(), invalid_manifest_content.size()));
   creator.reset(new ExtensionCreator());
   ASSERT_FALSE(creator->Run(temp_dir2.path(), crx_path, privkey_path,
                             base::FilePath(), ExtensionCreator::kOverwriteCRX));
+
+  // Try packing with an invalid private key. Should fail.
+  base::FilePath invalid_private_key = data_dir_.AppendASCII("invalid.pem");
+  creator.reset(new ExtensionCreator());
+  ASSERT_FALSE(creator->Run(input_directory, crx_path, invalid_private_key,
+                            base::FilePath(), ExtensionCreator::kOverwriteCRX));
 }
 
 // Test Packaging and installing an extension whose name contains punctuation.
 TEST_F(ExtensionServiceTest, PackPunctuatedExtension) {
   InitializeEmptyExtensionService();
   base::FilePath input_directory = data_dir_
       .AppendASCII("good")
       .AppendASCII("Extensions")
       .AppendASCII(good0)
       .AppendASCII("1.0.0.0");
@@ skipping 4117 matching lines @@
   provider->UpdateOrAddExtension(updates_from_webstore, "1", crx_path);
 
   service_->CheckForExternalUpdates();
   content::WindowedNotificationObserver(
       chrome::NOTIFICATION_CRX_INSTALLER_DONE,
       content::NotificationService::AllSources()).Wait();
   EXPECT_TRUE(extensions::HasExternalInstallError(service_));
   EXPECT_FALSE(extensions::HasExternalInstallBubble(service_));
   EXPECT_FALSE(service_->IsExtensionEnabled(updates_from_webstore));
 }