chromeos: Check both original and absolute paths for file: scheme

extensions/browser/extension_protocols.cc

 // Copyright 2014 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/browser/extension_protocols.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 266 matching lines @@
 
  private:
   ~URLRequestExtensionJob() override {
     UMA_HISTOGRAM_COUNTS("ExtensionUrlRequest.TotalKbRead", bytes_read_ / 1024);
     UMA_HISTOGRAM_COUNTS("ExtensionUrlRequest.SeekPosition", seek_position_);
     if (request_timer_.get())
       UMA_HISTOGRAM_TIMES("ExtensionUrlRequest.Latency",
                           request_timer_->Elapsed());
   }
 
+  bool CanAccessFile(const base::FilePath& original_path,
+                     const base::FilePath& absolute_path) override {
+    // The access checks for the file are performed before the job is
+    // created, so we should know that this is safe.
+    DCHECK(directory_path_.IsParent(original_path));
+    return true;
+  }
+
   void OnFilePathAndLastModifiedTimeRead(base::FilePath* read_file_path,
                                          base::Time* last_modified_time) {
     file_path_ = *read_file_path;
     response_info_.headers = BuildHttpHeaders(
         content_security_policy_,
         send_cors_header_,
         *last_modified_time);
     URLRequestFileJob::Start();
   }
 
@@ skipping 313 matching lines @@
                                extensions::InfoMap* extension_info_map) {
   return base::MakeUnique<ExtensionProtocolHandler>(is_incognito,
                                                     extension_info_map);
 }
 
 void SetExtensionProtocolTestHandler(ExtensionProtocolTestHandler* handler) {
   g_test_handler = handler;
 }
 
 }  // namespace extensions