Clean kForever from basictypes and move it to the interfaces that actually have it.

R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/33269004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@8296 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/base/autodetectproxy.cc b/base/autodetectproxy.cc
index bc54b96..8878d41 100644
--- a/base/autodetectproxy.cc
+++ b/base/autodetectproxy.cc
@@ -55,7 +55,7 @@
     LOG(LS_INFO) << "AutoDetectProxy initiating proxy classification";
     Next();
     // Process I/O until Stop()
-    Thread::Current()->ProcessMessages(kForever);
+    Thread::Current()->ProcessMessages(Thread::kForever);
     // Clean up the autodetect socket, from the thread that created it
     delete socket_;
   }