Re-enable StartPageWebUITest with a fix.

By r248702, start_page webUI always call setSpeechRecognitionState
on loading. The test has to handle this message.

BUG=339340
R=xiyuan@chromium.org
TEST=20x browser_tests and no failures

Review URL: https://codereview.chromium.org/159553002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250393 0039d316-1c4b-4281-b951-d872f2087c98
Remove calls to EmitLoginPromptReady

The upstart event emitted by this call is no longer used
for anything and hasn't been for some time. Remove it.

BUG=chromium:324514
TEST=browser_tests

Review URL: https://codereview.chromium.org/138913012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250394 0039d316-1c4b-4281-b951-d872f2087c98
If SDCH is disabled, don't add an SDCH filter

This avoids a crash when SDCH is disabled, but the "Content-Encoding" response header contains "sdch".

BUG=167218

Review URL: https://codereview.chromium.org/138533008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250395 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250394
SVN changes up to revision 250395