PPAPI (Flash): Properly honor Pepper url requests with custom user agents.

BUG=134615
TEST=With suitably recent Flapper: http://10tv.nana10.co.il/ streams properly
     (see bug for appropriate things to click).

Review URL: https://chromiumcodereview.appspot.com/10780019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@147060 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed