Improve parsing manifest for FSP API.

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 695 matching lines @@
     "Permission '*' is unknown or URL pattern is malformed.";
 const char kReservedMessageFound[] =
     "Reserved key * found in message catalog.";
 const char kUnrecognizedManifestKey[] = "Unrecognized manifest key '*'.";
 const char kUnrecognizedManifestProperty[] =
     "Unrecognized property '*' of manifest key '*'.";
 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";
+    "Extensions cannot install plugins on Chrome OS.";
+const char kInvalidFileSystemProviderMissingCapabilities[] =
+    "The 'fileSystemProvider' permission requires the "
+    "'file_system_provider_capabilities' section to be specified in the "
+    "manifest.";
+const char kInvalidFileSystemProviderMissingPermission[] =
+    "The 'file_system_provider_capabilities' section requires the "
+    "'fileSystemProvider' permission to be specified in the manifest.";
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions