Fix browser crash when parsing invalid Settings Override extension

extensions/common/manifest_constants.cc

 // Copyright 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 "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 namespace manifest_keys {
 
@@ skipping 521 matching lines @@
 const char kInvalidRunAt[] =
     "Invalid value for 'content_scripts[*].run_at'.";
 const char kInvalidSandboxedPagesList[] =
     "Invalid value for 'sandbox.pages'.";
 const char kInvalidSandboxedPage[] =
     "Invalid value for 'sandbox.pages[*]'.";
 const char kInvalidSandboxedPagesCSP[] =
     "Invalid value for 'sandbox.content_security_policy'.";
 const char kInvalidScriptBadge[] =
     "Invalid value for 'script_badge'.";
+const char kInvalidSearchEngineURL[] =
+    "Invalid URL [*] for 'chrome_settings_overrides.search_provider'.";
 const char kInvalidEmptySettingsOverrides[] =
     "Empty dictionary for 'chrome_settings_overrides'.";
 const char kInvalidShortName[] =
     "Invalid value for 'short_name'.";
 const char kInvalidSignature[] =
     "Value 'signature' is missing or invalid.";
 const char kInvalidSpellcheck[] =
     "Invalid value for 'spellcheck'.";
 const char kInvalidSpellcheckDictionaryFormat[] =
     "Invalid value for spellcheck dictionary format.";
@@ skipping 129 matching lines @@
 const char kWebRequestConflictsWithLazyBackground[] =
     "The 'webRequest' API cannot be used with event pages.";
 #if defined(OS_CHROMEOS)
 const char kIllegalPlugins[] =
     "Extensions cannot install plugins on Chrome OS";
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions