Code: MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
     ScriptContext* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction(
      "GetMediaFileSystemObject",
       base::Bind(&MediaGalleriesCustomBindings::GetMediaFileSystemObject,
                  base::Unretained(this)));
 }

Commit Message: [Extensions] Add more bindings access checks

BUG=598165

Review URL: https://codereview.chromium.org/1854983002

Cr-Commit-Position: refs/heads/master@{#385282}
CWE ID: 
MediaGalleriesCustomBindings::MediaGalleriesCustomBindings(
     ScriptContext* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction(
      "GetMediaFileSystemObject", "mediaGalleries",
       base::Bind(&MediaGalleriesCustomBindings::GetMediaFileSystemObject,
                  base::Unretained(this)));
 }
