Switch to using base/constructormagic.h and remove system_wrappers/interface/constructor_magic.h.

Same as https://webrtc-codereview.appspot.com/19519004. The issue in
http://chromegw.corp.google.com/i/internal.chromium.webrtc.fyi/builders/Linux...
is solved by this change
http://src.chromium.org/viewvc/chrome/trunk/src/third_party/libjingle/libjing...
(tested locally).

BUG=3380
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/17619005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6218 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/neteq4/sync_buffer.h b/webrtc/modules/audio_coding/neteq4/sync_buffer.h
index 0659f19..8deb950 100644
--- a/webrtc/modules/audio_coding/neteq4/sync_buffer.h
+++ b/webrtc/modules/audio_coding/neteq4/sync_buffer.h
@@ -11,8 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_SYNC_BUFFER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_SYNC_BUFFER_H_
 
+#include "webrtc/base/constructormagic.h"
 #include "webrtc/modules/audio_coding/neteq4/audio_multi_vector.h"
-#include "webrtc/system_wrappers/interface/constructor_magic.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {