Bug 911972 - patch 1 - MessagePort/Channel moved in a separate folder, r=smaug

--HG--
rename : dom/base/MessageChannel.cpp => dom/messagechannel/MessageChannel.cpp
rename : dom/base/MessageChannel.h => dom/messagechannel/MessageChannel.h
rename : dom/base/MessagePort.cpp => dom/messagechannel/MessagePort.cpp
rename : dom/base/MessagePort.h => dom/messagechannel/MessagePort.h
rename : dom/base/MessagePortList.cpp => dom/messagechannel/MessagePortList.cpp
rename : dom/base/MessagePortList.h => dom/messagechannel/MessagePortList.h
rename : dom/base/test/iframe_messageChannel_chrome.html => dom/messagechannel/tests/iframe_messageChannel_chrome.html
rename : dom/base/test/iframe_messageChannel_cloning.html => dom/messagechannel/tests/iframe_messageChannel_cloning.html
rename : dom/base/test/iframe_messageChannel_pingpong.html => dom/messagechannel/tests/iframe_messageChannel_pingpong.html
rename : dom/base/test/iframe_messageChannel_post.html => dom/messagechannel/tests/iframe_messageChannel_post.html
rename : dom/base/test/test_messageChannel.html => dom/messagechannel/tests/test_messageChannel.html
rename : dom/base/test/test_messageChannel.xul => dom/messagechannel/tests/test_messageChannel.xul
rename : dom/base/test/test_messageChannel_cloning.html => dom/messagechannel/tests/test_messageChannel_cloning.html
rename : dom/base/test/test_messageChannel_pingpong.html => dom/messagechannel/tests/test_messageChannel_pingpong.html
rename : dom/base/test/test_messageChannel_post.html => dom/messagechannel/tests/test_messageChannel_post.html
rename : dom/base/test/test_messageChannel_pref.html => dom/messagechannel/tests/test_messageChannel_pref.html
rename : dom/base/test/test_messageChannel_start.html => dom/messagechannel/tests/test_messageChannel_start.html
rename : dom/base/test/test_messageChannel_transferable.html => dom/messagechannel/tests/test_messageChannel_transferable.html
rename : dom/base/test/test_messageChannel_unshipped.html => dom/messagechannel/tests/test_messageChannel_unshipped.html
Bug 911972 - patch 2 - MessagePort/Channel with PBackground, r=smaug
Bug 911972 - patch 3 - MessagePort Shared Queue, r=smaug
Bug 911972 - patch 4 - transferable objects in MessagePort, r=smaug
Bug 911972 - patch 5 - transferable MessagePort objects in workers
Bug 911972 - patch 6 - bfcache for MessagePort, r=smaug