Switch C++-style C headers with their C equivalents.

The C++ headers define the C functions within the std:: namespace, but
we mainly don't use the std:: namespace for C functions. Therefore we
should include the C headers.

BUG=1833
R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1917004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4486 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/neteq4/delay_manager.h b/webrtc/modules/audio_coding/neteq4/delay_manager.h
index 9d385e7..d46924f 100644
--- a/webrtc/modules/audio_coding/neteq4/delay_manager.h
+++ b/webrtc/modules/audio_coding/neteq4/delay_manager.h
@@ -11,7 +11,8 @@
 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ4_DELAY_MANAGER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_DELAY_MANAGER_H_
 
-#include <cstring>  // Provide access to size_t.
+#include <string.h>  // Provide access to size_t.
+
 #include <vector>
 
 #include "webrtc/modules/audio_coding/neteq4/interface/audio_decoder.h"