[spelling] existance to existence

content/browser/plugin_private_storage_helper.cc

 // Copyright 2016 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 "content/browser/plugin_private_storage_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 25 matching lines @@
 
 std::string StringTypeToString(const base::FilePath::StringType& value) {
 #if defined(OS_POSIX)
   return value;
 #elif defined(OS_WIN)
   return base::WideToUTF8(value);
 #endif
 }
 
 // Helper for checking the plugin private data for a specified origin and
-// plugin for the existance of any file that matches the time range specified.
+// plugin for the existence of any file that matches the time range specified.
 // All of the operations in this class are done on the IO thread.
 //
 // This class keeps track of outstanding async requests it generates, and does
 // not call |callback_| until they all respond (and thus don't need to worry
 // about lifetime of |this| in the async requests). If the data for the origin
 // needs to be deleted, it needs to be done on the file task runner, so we
 // want to ensure that there are no pending requests that may prevent the
 // date from being deleted.
 class PluginPrivateDataByOriginChecker {
  public:
@@ skipping 361 matching lines @@
     origins.insert(storage_origin);
   }
 
   PluginPrivateDataDeletionHelper* helper = new PluginPrivateDataDeletionHelper(
       std::move(filesystem_context), begin, end, callback);
   helper->CheckOriginsOnFileTaskRunner(origins);
   // |helper| will delete itself when all origins have been checked.
 }
 
 }  // namespace content