Revert "Implement a JavaScript API for document scanning"

extensions/common/permissions/permission_message.h

 // 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.
 
 #ifndef EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_H_
 #define EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 72 matching lines @@
     kOverrideBookmarksUI,
     kAutomation,
     kAccessibilityFeaturesModify,
     kAccessibilityFeaturesRead,
     kBluetoothPrivate,
     kIdentityEmail,
     kExperienceSamplingPrivate,
     kCopresence,
     kTopSites,
     kU2fDevices,
-    kDocumentScan,
-    // Last entry: Add new entries above and ensure to update the
-    // "ExtensionPermission2" enum in tools/metrics/histograms/histograms.xml.
     kEnumBoundary,
   };
   COMPILE_ASSERT(PermissionMessage::kNone > PermissionMessage::kUnknown,
                  kNone_not_greater_than_kUnknown);
 
   // Creates the corresponding permission message.
   PermissionMessage(ID id, const base::string16& message);
   PermissionMessage(ID id,
                     const base::string16& message,
                     const base::string16& details);
@@ skipping 25 matching lines @@
   ID id_;
   base::string16 message_;
   base::string16 details_;
 };
 
 typedef std::vector<PermissionMessage> PermissionMessages;
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_PERMISSIONS_PERMISSION_MESSAGE_H_