Fix flaky thread number DCHECK in KioskTest.

EmbeddedTestServer::StopThread might be returned before GetNumberOfThreads
gets an updated thread number. Add a busy loop to wait for it to update.

BUG=322732

Review URL: https://codereview.chromium.org/105823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239141 0039d316-1c4b-4281-b951-d872f2087c98
Removing the logic to strip url parameters when accessing content:
schemes. This was historically used by htmlviewer and android stock
browser.

BUG=https://code.google.com/p/android/issues/detail?id=62046
    b/11654127

Review URL: https://codereview.chromium.org/105913003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239142 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239142