Convert usage of ARRAY_SIZE to arraysize.

ARRAY_SIZE is the old version of arraysize and does not cover
all the cases in C++, arraysize is a copy of Chromium's
version and thus have wider coverage.

BUG=None
R=tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1405023016

Cr-Commit-Position: refs/heads/master@{#10594}
diff --git a/webrtc/base/stringencode_unittest.cc b/webrtc/base/stringencode_unittest.cc
index 406d9c7..588e9d8 100644
--- a/webrtc/base/stringencode_unittest.cc
+++ b/webrtc/base/stringencode_unittest.cc
@@ -8,6 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include "webrtc/base/arraysize.h"
 #include "webrtc/base/common.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/stringencode.h"
@@ -48,7 +49,7 @@
     }
 
     char buffer[5];
-    memset(buffer, 0x01, ARRAY_SIZE(buffer));
+    memset(buffer, 0x01, arraysize(buffer));
     ASSERT_EQ(kTests[i].enclen, utf8_encode(buffer,
                                             kTests[i].encsize,
                                             kTests[i].decoded));
@@ -56,7 +57,7 @@
     // Make sure remainder of buffer is unchanged
     ASSERT_TRUE(memory_check(buffer + kTests[i].enclen,
                              0x1,
-                             ARRAY_SIZE(buffer) - kTests[i].enclen));
+                             arraysize(buffer) - kTests[i].enclen));
   }
 }