Fix race in PluginDataRemoverImpl going away while it's still being used on the IO thread, which was introduced in 110530. This also fix the incorrect usage of PluginService::OpenChannelToNpapiPlugin on the UI thread which existed before.

BUG=104553,cros:23179
Review URL: http://codereview.chromium.org/8603012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110979 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed