Eliminate unnecessary #include

R=henrika@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/14979004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6690 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/checks.h b/webrtc/base/checks.h
index 5a2841a..7b02ffb 100644
--- a/webrtc/base/checks.h
+++ b/webrtc/base/checks.h
@@ -14,8 +14,6 @@
 #ifndef WEBRTC_BASE_CHECKS_H_
 #define WEBRTC_BASE_CHECKS_H_
 
-#include <string.h>
-
 namespace rtc {
 
 // Prints an error message to stderr and aborts execution.