Add window_bits to DeflateStream constructor

Allow specifying the window size that is used for transmitting data,
ie. client_max_window_size.

Add tests WindowBits8 and WindowBits10 to verify that the parameter is
effective.

BUG=280910
TEST=net_unittests --gtest_filter=WebSocketDeflateStream*

Review URL: https://codereview.chromium.org/143823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246012 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246012