Update Android EME IPC

The EME IPC message CreateSession() now uses an enum for session type rather
than passing a string. Also updates SessionMessage() to use a GURL rather than
just passing a string.

BUG=327449,326663
TEST=Able to play encrypted media on Android

Review URL: https://codereview.chromium.org/126633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248267 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248267
Mark .url files as DANGEROUS on Windows.

BUG=335029
TEST=Downloading a .url file on Windows results in the "dangerous download"
warning.

Review URL: https://codereview.chromium.org/148673003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248268 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248268