CEF 2171
remove ClientHandler::DoClose() override
Merge pull request #492 from adobe/jeff/cef_2171_final

CEF 2171
Merge remote-tracking branch 'upstream/master'
- update release to 1.2
Merge pull request #493 from adobe/ingo/set-release-1.2

update release to 1.2
- exclude ffmpegsumo.so and PDFlib from build
Merge branch 'release'
Merge remote-tracking branch 'upstream/master'