Fix crash by preventing extensions from changing their IDs.

chrome/common/extensions/extension_constants.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/common/extensions/extension_constants.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 126 matching lines @@
 // cross-platform.
 namespace extension_manifest_errors {
 const char* kAppsNotEnabled =
     "Apps are not enabled.";
 const char* kBackgroundPermissionNeeded =
     "Hosted apps that use 'background_page' must have the 'background' "
     "permission.";
 const char* kCannotAccessPage =
     "Cannot access contents of url \"*\". "
     "Extension manifest must request permission to access this host.";
+const char* kCannotChangeExtensionID =
+    "Installed extensions cannot change their IDs.";
 const char* kCannotClaimAllHostsInExtent =
     "Cannot claim all hosts ('*') in an extent.";
 const char* kCannotClaimAllURLsInExtent =
     "Cannot claim all URLs in an extent.";
 const char* kCannotScriptGallery =
     "The extensions gallery cannot be scripted.";
 const char* kCannotUninstallManagedExtension =
     "Attempted uninstallation of an extension that is not user-manageable.";
 const char* kChromeVersionTooLow =
     "This extension requires * version * or greater.";
@@ skipping 341 matching lines @@
 const char* kCloudPrintAppId = "mfehgcgbbipciphmccgaenjidiccnmng";
 const char* kAppsPromoHistogram = "Extensions.AppsPromo";
 const char* kAppLaunchHistogram = "Extensions.AppLaunch";
 #if defined(OS_CHROMEOS)
 const char* kAccessExtensionPath =
     "/usr/share/chromeos-assets/accessibility/extensions";
 const char* kChromeVoxDirectoryName = "access_chromevox";
 #endif
 
 }