When translating a page, get the code and translation via HTTPS.

      For some reason, the error reporting page doesn't work over HTTPS yet.
That's a separate bug, and when it is fixed we'll fix the last http: URL in
this file.

BUG=112236
TEST=browser_tests: TranslateManagerTest.*; translation still works, and reporting a translation error still works

Review URL: http://codereview.chromium.org/9320015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120113 0039d316-1c4b-4281-b951-d872f2087c98