Cookie commands for the webdriver protocol

Implements the following URLs for WebDriver:
/session/:sessionId/cookie (GET POST DELETE)
/session/:sessionId/cookie/:name (DELETE)

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6330012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75029 0039d316-1c4b-4281-b951-d872f2087c98
18 files changed