[Extensions] Remove ExtensionFunction usage of RenderViewHost

chrome/browser/chromeos/extensions/file_manager/private_api_misc.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.
 //
 // This file provides miscellaneous API functions, which don't belong to
 // other files.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_
 
@@ skipping 70 matching lines @@
   ~FileManagerPrivateInternalZipSelectionFunction() override;
 
   // AsyncExtensionFunction overrides.
   bool RunAsync() override;
 
   // Receives the result from ZipFileCreator.
   void OnZipDone(bool success);
 };
 
 // Implements the chrome.fileManagerPrivate.zoom method.
-// Changes the zoom level of the file manager by internally calling
-// RenderViewHost::Zoom(). TODO(hirono): Remove this function once the zoom
-// level change is supported for all apps. crbug.com/227175.
+// Changes the zoom level of the file manager by modifying the zoom level of the
+// WebContents.
+// TODO(hirono): Remove this function once the zoom level change is supported
+// for all apps. crbug.com/227175.
 class FileManagerPrivateZoomFunction : public ChromeSyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileManagerPrivate.zoom",
                              FILEMANAGERPRIVATE_ZOOM);
 
  protected:
   ~FileManagerPrivateZoomFunction() override {}
 
   // AsyncExtensionFunction overrides.
   bool RunSync() override;
@@ skipping 161 matching lines @@
   void OnCompleted(base::File::Error result);
 
   const ChromeExtensionFunctionDetails chrome_details_;
   DISALLOW_COPY_AND_ASSIGN(
       FileManagerPrivateInternalExecuteCustomActionFunction);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MISC_H_