Remove DummyThreadObject.
Remove DummyThreadObject.

Remove DummyThreadObject as we don't really need it and it causes warnings in component chromium build on mac.

BUG=http://crbug.com/146389

Review URL: https://webrtc-codereview.appspot.com/765010

git-svn-id: 3dec5013d1058009ad43391d70f26dc8df6acd9d@180 dd674b97-3498-5ee5-1854-bdd07cd0ff33

vigsterkr/libjingle,lukeweber/libjingle-override,MindsIgnited/libjingle,jgrowl/libjingle,wangscript/libjingle-1,deepak899/libjingle,iamnpc/libjingle,deepak899/libjingle,iamnpc/libjingle,lukeweber/libjingle-override,xhook/libjingle,volkanh/libjingle,shiquxinkong/jingle,jgrowl/libjingle,jgrowl/libjingle,princeofdarkness76/swtoolkit,jgrowl/libjingle,princeofdarkness76/swtoolkit,deepak899/libjingle,wangscript/libjingle,jgrowl/libjingle,bitemyapp/libjingle,MindsIgnited/libjingle,princeofdarkness76/swtoolkit,wangscript/libjingle,volkanh/libjingle,xhook/libjingle,shiquxinkong/jingle,lukeweber/libjingle-override,wangscript/libjingle-1,deepak899/libjingle,bitemyapp/libjingle,princeofdarkness76/swtoolkit,bitemyapp/libjingle,wangscript/libjingle-1,wangscript/libjingle,volkanh/libjingle,iamnpc/libjingle,xhook/libjingle,goddino/libjingle,deepak899/libjingle,wangscript/libjingle-1,volkanh/libjingle,shiquxinkong/jingle,xhook/libjingle,wangscript/libjingle,goddino/libjingle,volkanh/libjingle,wangscript/libjingle,princeofdarkness76/swtoolkit,goddino/libjingle,shiquxinkong/jingle,wangscript/libjingle-1,volkanh/libjingle,shiquxinkong/jingle,wangscript/libjingle-1,bitemyapp/libjingle,vigsterkr/libjingle,iamnpc/libjingle,iamnpc/libjingle,wangscript/libjingle,shiquxinkong/jingle,goddino/libjingle,deepak899/libjingle,vigsterkr/libjingle,princeofdarkness76/swtoolkit,MindsIgnited/libjingle,iamnpc/libjingle,vigsterkr/libjingle,bitemyapp/libjingle,wangscript/libjingle-1,goddino/libjingle,lukeweber/libjingle-override,bitemyapp/libjingle,xhook/libjingle,vigsterkr/libjingle,lukeweber/libjingle-override