Narrower include for constructormagic.h in Chromium.

Replacing #include of "base/basictypes.h" in
overrides/webrtc/base/constructormagic.h with "base/macros.h". Our
version of constructormagic.h is not meant to include the base types,
only DISALLOW_COPY_AND_ASSIGN etc.

This fix is also a workaround for our overrides in Chromium seemingly
including the wrong things for certain webrtc targets like
audio_processing, so it looks like this #include "base/basictypes.h"
didn't include Chromium's base/basictypes.h but webrtc/base/basictypes.h
somehow, hence DISALLOW_COPY_AND_ASSIGN wasn't defined, causing the
revert in r7151.

R=henrike@webrtc.org, tommi@webrtc.org
BUG=3070
TEST=Chromium still builds locally with this change.

Review URL: https://webrtc-codereview.appspot.com/27509004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7204 4adac7df-926f-26a2-2b94-8c16560cd09d