Convert usage of ARRAY_SIZE to arraysize.

talk/media/webrtc/webrtcmediaengine.cc

Index: talk/media/webrtc/webrtcmediaengine.cc
diff --git a/talk/media/webrtc/webrtcmediaengine.cc b/talk/media/webrtc/webrtcmediaengine.cc
index af202bd6130c79ec544754b91bada11ecdc3215a..e1d4ac2653be0ecea9922aedbac0c3f8a8281564 100644
--- a/talk/media/webrtc/webrtcmediaengine.cc
+++ b/talk/media/webrtc/webrtcmediaengine.cc
@@ -28,6 +28,7 @@
 #include "talk/media/webrtc/webrtcmediaengine.h"
 #include "talk/media/webrtc/webrtcvideoengine2.h"
 #include "talk/media/webrtc/webrtcvoiceengine.h"
+#include "webrtc/base/arraysize.h"
 
 namespace cricket {
 
@@ -72,8 +73,7 @@ const char* kBweExtensionPriorities[] = {
     kRtpTransportSequenceNumberHeaderExtension,
     kRtpAbsoluteSenderTimeHeaderExtension, kRtpTimestampOffsetHeaderExtension};
 
-const size_t kBweExtensionPrioritiesLength =
-    ARRAY_SIZE(kBweExtensionPriorities);
+const size_t kBweExtensionPrioritiesLength = arraysize(kBweExtensionPriorities);
 
 int GetPriority(const RtpHeaderExtension& extension,
                 const char* extension_prios[],