Follow-on fixes and naming changes for https://codereview.chromium.org/12086077/

BUG=172573
Review URL: https://codereview.chromium.org/12177018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180600 0039d316-1c4b-4281-b951-d872f2087c98
  PluginInfoMessageFilterTest() :
      foo_plugin_path_(FILE_PATH_LITERAL("/path/to/foo")),
      bar_plugin_path_(FILE_PATH_LITERAL("/path/to/bar")),
      file_thread_(content::BrowserThread::FILE, &message_loop_) {
  }

  PluginInfoMessageFilterTest() :
      foo_plugin_path_(FILE_PATH_LITERAL("/path/to/foo")),
      bar_plugin_path_(FILE_PATH_LITERAL("/path/to/bar")),
      file_thread_(content::BrowserThread::FILE, &message_loop_) {
  }
